Dear Flubber son - I'm afraid that this happens in my glider once in awhile but only for short time periods as the sounds of the airplane starting to spiral dive quickly brings the pilot to alertness. Not a big concern though, this only happens on weekdays in very remote places where there is essentially no traffic at all and when altitude is abundant. The scenario is always this: the pilot is on a record attempt and did not get much sleep the night before. Most record attempt flights involve choosing to abort at some point when the pilot is clearly falling behind his objective. The pilot is perfectly alert while still striving for a record, but the instant that the pilot makes the decision to abort, the pilot gets pretty nappy.