It isn't just "peptides" and "circadian rhythms". Sleep is about much more than just being unconscious, which why sleeping pills don't solve the problem of sleep, they solve the problem of consciousness.
Sleep is what your brain and body do during the time you are asleep. Just because you're unconscious, doesn't mean you are getting good sleep.
At my company SoundMind we're identifying bursts of brain activity in your deepest sleep called Slow-Wave Oscillations (SWOs). When we detect an SWO, we have a short window in which to stimulate your brain, which causes your SWOs to increase in both power, and the number of slow waves. This results in up to 40% improvement in the performance of deep sleep. This is an improvement to the most important part of sleep, which is why we're starting here. SWOs are responsible for the clearing of Amyloid plaques, memory consolidation, and regulation of hormones such as GH, cortisol, insulin, and prolactin.
If you want to find out more, check us out at https://soundmind.co