question: Why when you fall to sleep for a short period of time do you oftan wake up feeling more tired then before?
comment: your body releases a chemical to help you fall asleep, when you wake up you are still under it's effects for a few minutes.
passages: Set point of ventilation is different in wakefulness and sleep. pCO2 is higher and ventilation is lower in sleep. Sleep onset in normal subjects is not immediate, but oscillates between arousal, stage I and II sleep before steady NREM sleep is obtained. So falling asleep results in decreased ventilation and a higher pCO2, above the wakefulness set point. On wakefulness, this constitutes an error signal which provokes hyperventilation until the wakefulness set point is reached. When the subject falls asleep, ventilation decreases and pCO2 rises, resulting in hypoventilation or even apnea. These oscillations continue until steady state sleep is obtained. The medulla oblongata controls our respiration.
   On February 17, 2009 "What It Takes" was released and peaked at No. 20 on the Top Heatseekers chart, garnering positive reviews. In April, the band played shows in Ontario with Bring Me the Horizon.
   Sleepiness can be dangerous when performing tasks that require constant concentration, such as driving a vehicle. When a person is sufficiently fatigued, microsleeps may be experienced. In individuals deprived of sleep, somnolence may spontaneously dissipate for short periods of time; this phenomenon is the second wind, and results from the normal cycling of the circadian rhythm interfering with the processes the body carries out to prepare itself to rest.
  
  The word "somnolence" is derived from the Latin "somnus" meaning "sleep".
  
  Section::::Causes.
  
  Section::::Causes.:Circadian rhythm disorders.
   A far more famous instance of a "long sleep" today is the Christian legend of the Seven Sleepers of Ephesus, in which seven Christians flee into a cave during pagan times in order to escape persecution, but fall asleep and wake up 360 years later to discover, to their astonishment, that the Roman Empire is now predominantly Christian. The American author Washington Irving's short story "Rip Van Winkle", first published in 1819 in his collection of short stories "The Sketch Book of Geoffrey Crayon, Gent.", is about a man in colonial America named Rip Van Winkle who falls asleep on one of the Catskill Mountains and wakes up twenty years later after the American Revolution. The story is now considered one of the greatest classics of American literature.
   Sleep debt has been tested in a number of studies through the use of a sleep onset latency test. This test attempts to measure how easily a person can fall asleep. When this test is done several times during a day, it is called a "multiple sleep latency test" (MSLT). The subject is told to go to sleep and is awakened after determining the amount of time it took to fall asleep. The Epworth Sleepiness Scale (ESS), an eight item questionnaire with scores ranging from 0 to 24, is another tool used to screen for potential sleep debt.
   BULLET::::- : A pulsus paradoxus is an exaggerated decrease in systolic blood pressure during inspiration. It can indicate certain medical conditions in which there is reduced cardiac output, such as cardiac tamponade or constrictive pericarditis. Also known as the Pulse Paradox.
  
  BULLET::::- : The "second wind" is a sudden period of increased wakefulness in individuals deprived of sleep that tends to coincide with the individual's circadian rhythm. Although the individual is more wakeful and aware of their surroundings, they are continuing to accrue sleep debt and thus, are actually exacerbating their sleep deprivation.
  
  Section::::Chemistry.
   It is common for patients who have difficulty falling asleep to also have nocturnal awakenings with difficulty returning to sleep. Two-thirds of these patients wake up in the middle of the night, with more than half having trouble falling back to sleep after a middle-of-the-night awakening.
   It is not necessarily accompanied by drowsiness, however. Patients may be awake (not sleepy) yet still have a clouded consciousness (disorder of wakefulness). Paradoxically, sufferers declare that they are "awake but, in another way, not". Lipowski points out that decreased "wakefulness" as used here is not exactly synonymous with drowsiness. One is a stage on the way to coma, the other on the way to sleep which is very different.
   One study presented a series of tasks of increasing difficulty to 16 young adults who had not slept in 35 hours and observed heightened activity in several brain regions using magnetic resonance imaging. Researcher Sean P.A. Drummond commented that the ability to summon a second wind allowed them to "call on cognitive resources they have that they normally don't need to use to do a certain task". (He also noted that their performance, though an improvement considering their state of sleep deprivation, were below what it would be had they slept.)
   While You Were Sleeping
  
  While You Were Sleeping may refer to:
  
  Section::::Film and television.
  
  BULLET::::- "While You Were Sleeping" (film), a movie from 1995
  
  BULLET::::- "While You Were Sleeping", an episode from TV series "Elementary"
  
  BULLET::::- "While You Were Sleeping" (2011 TV series), a South Korean television series
  
  BULLET::::- "While You Were Sleeping" (2017 TV series), a South Korean television series
  
  BULLET::::- "While You Were Sleeping" ("The Vampire Diaries"), an episode of the TV series "The Vampire Diaries"
  
  Section::::Music.
  
  BULLET::::- "While You Were Sleeping" (album), a compilation album of Canadian rapper Classified
   Thus, in many people, there is a dip when the drive for sleep has been building for hours and the drive for wakefulness has not yet started. This is, again quoting Czeisler, "a great time for a nap". The drive for wakefulness intensifies through the evening, making it difficult to get to sleep 2–3 hours before one's usual bedtime when the "wake maintenance zone" ends.
  
  Section::::Sleep cultures.
   Second wind (sleep)
  
  Second wind (or third wind, fourth wind, etc.), also occasionally referred to as the wake maintenance zone, is a sleep phenomenon in which a person, after a prolonged period of staying awake, temporarily ceases to feel drowsy, often making it difficult to fall asleep once it happens. They are the result of circadian rhythms cycling into a phase of wakefulness. For example, many people experience the effects of a second wind in the early morning even after an entire night without sleep because it is the time when they would normally wake up.
   BULLET::::- Naps: students taking a nap of one to two hours in the early evening hours (between 6:45–8:30 p.m.) had no cortisol awakening response, suggesting cortisol awakening response only occurs after night sleep.
  
  BULLET::::- Waking up in the light: cortisol awakening response is larger when people wake up in light rather than darkness.
  
  BULLET::::- Noise: there is no cortisol rise after nights with traffic-like low-frequency noise.
  
  BULLET::::- Alarm clock vs. spontaneous waking: there is no difference on days when people woke up spontaneously or used the alarm clock.
   People with normal circadian systems can generally fall asleep quickly at night if they slept too little the night before. Falling asleep earlier will in turn automatically help to advance their circadian clocks due to decreased light exposure in the evening. In contrast, people with DSPD have difficulty falling asleep before their usual sleep time, even if they are sleep-deprived. Sleep deprivation does not reset the circadian clock of DSPD patients, as it does with normal people.
   Section::::In circadian rhythms.:Melatonin.
  
  The phase response curve for melatonin is roughly twelve hours out of phase with the phase response curve for light. At spontaneous wake-up time, exogenous (externally administered) melatonin has a slight phase-delaying effect. The amount of phase-delay increases until about eight hours after wake-up time, when the effect swings abruptly from strong phase delay to strong phase advance. The phase-advance effect diminishes as the day goes on until it reaches zero about bedtime. From usual bedtime until wake-up time, exogenous melatonin has no effect on circadian phase.
   Finally, on the opposite end of the spectrum, other patients may report feeling that they have slept much longer than is observed. It has been proposed that this experience be subclassified under sleep state misperception as "positive sleep state misperception", "reverse sleep state misperception", and "negative sleep state misperception".
  
  Section::::Symptoms and diagnosis.:Diagnostic criteria.
   Caffeine-induced sleep disorder is a psychiatric disorder that results from overconsumption of the stimulant caffeine. "When caffeine is consumed immediately before bedtime or continuously throughout the day, sleep onset may be delayed, total sleep time reduced, normal stages of sleep altered, and the quality of sleep decreased." Caffeine reduces slow-wave sleep in the early part of the sleep cycle and can reduce rapid eye movement sleep later in the cycle. Caffeine increases episodes of wakefulness, and high doses in the late evening can increase sleep onset latency. In elderly people, there is an association between use of medication containing caffeine and difficulty in falling asleep.
   Section::::Influences.
   The plot for "The Night The Bed Fell" starts with James Thurber's explaining his "interesting" family, including a crazy cousin that thinks he will die of suffocation during his sleep, and a grandfather that leaves the house for several days, coming back talking about the Civil War as if it was still on. When James falls out of his army cot and his mom mistakes the crash for his father's death, the story starts to get chaotic. The Night the Bed Fell.
   With Tired Eyes, Tired Minds, Tired Souls, We Slept
  
  "With Tired Eyes, Tired Minds, Tired Souls, We Slept " is the 16th episode of "One Tree Hill"'s third season. It first aired on The WB television network in the United States on March 1, 2006. It was written by Mark Schwahn and directed by Greg Prange, and revolves around a school shooting. 
   Caffeine is the most widely used alerting drug in the world and has been shown to improve alertness in simulated night work. Caffeine and naps before a night shift reduces sleepiness during the shift. Modafinil and armodafinil are non-amphetamine alerting drugs originally developed for the treatment of narcolepsy that have been approved by the FDA (the US Food and Drug Administration) for excessive sleepiness associated with SWSD.
  
  Section::::Treatment.:Medications that promote daytime sleep.
   The wake maintenance zone generally lasts 2 to 3 hours, during which one is less inclined to fall asleep. While potentially useful for completing urgent tasks, it may have a potentially unwanted side-effect of keeping one awake for several hours after the task has been completed. The hypervigilance and stimulation brought on by a second wind can cause fatigue, which, in the case of infants, can be literally painful. Thus, an infant may begin crying when sleep habits are disrupted.
  
  One can avoid "getting a second wind" by practicing proper sleep hygiene.
  
  Section::::Characteristics.:"Fifth day turning point".
   Windows Vista introduces a new Hybrid Sleep power-saving mode that combines hibernation and sleep mode functionality. When active, Hybrid Sleep saves information from a computer's memory to a hibernation file on disk, but instead of turning off the computer, it initiates sleep mode. Traditionally, systems that lose power while in sleep mode will also lose all data resident in memory. However, since systems that resume from Hybrid Sleep do so by retrieving information from a hibernation file on disk, they offer the benefits of quickly resuming when in sleep mode and improved reliability in the event of power loss.
   After releasing "Labyrinthine Heart", Elswick released two new tracks included in the compilation "Beauty 2 - Music That Touches The Soul", which was released on October 25, 2010. The first track, "Another Day", was sung by Kyoko Baertsoen and is a cover of the original song by This Mortal Coil. The second track, "Empyrean", was sung by Suzanne Perry and was performed with the glossolalia technique.
   Modafinil (brand name Provigil) is a stimulant approved in the US for treatment of shift-work sleep disorder, which shares some characteristics with DSPD. A number of clinicians prescribe it for DSPD patients, as it may improve a sleep-deprived patient's ability to function adequately during socially desirable hours. It is generally not recommended to take modafinil after noon; modafinil is a relatively long-acting drug with a half-life of 15 hours, and taking it during the later part of the day can make it harder to fall asleep at bedtime.
  