Researchers Don’t Think Humans Are Meant To Be Awake Past Midnight
The study’s senior author, Dr Elizabeth Klerman, said that “from a high-level, global, evolutionary standpoint, your internal biological circadian clock is tuned towards processes that promote sleep, not wakefulness, after midnight”.
Article source: https://www.huffingtonpost.co.uk/entry/mind-after-midnight-theory-explained_uk_6ab53903e4b075a3d2844e75