Sleep causes rest. Stay in bed is used for heal from illness. Close call with death causes avoid fight. Sight of food often does not cause avoid fight. Rest is used for rejuvenation. Stay in bed causes rest. Sleep does not cause you have something to eat. Stay in bed does not cause you have something to eat. Rest causes sleep. Sight of food often causes you fall asleep. Stay in bed does not cause one can gain knowledge. Rest causes you fall asleep.
Stay in bed does not cause sleep.