If I ever have a nap (sleep in the afternoon, or get up in the morning then go back to bed) I wake up with a sort of headache, and a dreadful mood.
Even if I desperately need the sleep, napping just doesn't seem worth it. (I think a lie in is ok, as long as I don't get up at all before it.)
Does anyone else get this? It's really annoying for me, and probably worse for my family. (Yesterday I fixed it by going out for a run, and came back fine - I guess it clears up after an hour or something?)