I get this way in spurts too, & am in one now. Mine seems to happen every other night or so, as I am tired the next night, after one of these spells, & sleep pretty well that night, lol. Then, it's like I catch up & it happens again. I often wonder if the seasonal weather changes, but just glad it's not all the time, every night... Hate to take anything, so sometimes I get back up for an hour or so, sip on some cold milk, read or whatever, then go back to bed & sleep this time around...thank goodness!...