I had heard that taking naps at a certain window of time in the afternoon (say between 2-4pm) boosts HGH production, and is used by athletes to maximize strength/recovery vs other hrs of the afternoon.
And regularly being awake at the opposite end (3am) is detrimental because you don't experience the HGH/recovery benefit, even if you're sleeping well during other hours.
Does this idea have any validity? Or does it not matter as long as you're getting good quality, uninterrupted sleep?