One of the cruelest aspects of whatever kind of insomnia I have is that while I normal get only 2-3 hours of sleep per night and feel disabled most of the day,

One of the cruelest aspects of whatever kind of insomnia I have is that while I normal get only 2-3 hours of sleep per night and feel disabled most of the day, every 3-5 years I get maybe 8-9 hours, and I have a pounding headache for the first 10 or so hours after I wake up.