I wonder if that 4am to 5am timeframe is relevant. I've been falling asleep at ~5am for the past few years... The key part may be "among severely depressed sub

I wonder if that 4am to 5am timeframe is relevant. I've been falling asleep at ~5am for the past few years... The key part may be "among severely depressed subjects," but I've noticed that whenever my sleep changes (stress-related, too, or a random early meeting) my following day is simply awful and I accomplish more-or-less nothing. Something that seems obvious now, but wasn't obvious to me until recently, is that people should be realllllyyy protective of their sleep. I guess that study supports that idea.