Better yet: wake at random, feeling as if an entire night of sleep is already done. Look at the clock and only two hours have elapsed and there is still an entire night to sleep.
Nonetheless, wake up before the alarm rings, feeling fully refreshed, as if two full nights of sleep have been had.
When I get these episodes, I feel like a champ the entire day. Sadly it also makes me a bit annoying, as it makes overjoyful.