There probably isn't just one sleep signal: there is a sleep drive (process S) and a circadian alertness signal that counteracts that (process C). http://lessw

There probably isn't just one sleep signal: there is a sleep drive (process S) and a circadian alertness signal that counteracts that (process C). http://lesswrong.com/r/discussion/lw/meu/solving_sleep_just_a_toedipping/ http://lesswrong.com/r/discussion/lw/meu/solving_sleep_just_... If the 'food clock' exists, there is a good chance that it works by inhibiting the circadian alertness signal, thus making the body feel more sleepy on net, until the alertness level rises again naturally.