You've got it, it absolutely is like that! It's such a subtle thing when you talk about it to people who obviously are trying to achieve things in a different mode, they'll say things like "come on, pull yourself together - you are simply not ambitious enough!" which makes you feel even more miserable and not productive. So we keep staying up all night - for a short period I managed to be able to rise at exactly 5 AM in the morning which was great but I endured it just for a month or so. You need discipline but you get much of your health back. I am working to get back in the habit again. Although nighttime has some additional quality for me which morning time doesn't seem to offer as much which is simply a higher frequency of creativity sparks (and maybe a higher error rate as well ;))