Every closed eye is not sleeping, and every open eye is not seeing. Bill Cosby
"Microsleeps are most likely to occur at certain times of the day, such as pre-dawn hours and mid-afternoon hours when the body is "programmed" to sleep. Microsleeps increase with cumulative sleep debt. In other words, the more sleep deprived a person is, the greater the chance a microsleep episode will occur."
Source: http://www.sleepaccess.com/about_sleep_apnea/microsleeps/default.aspx
Some local rider also had few micro sleep blackouts druing their 16hr ride.
"1200km covered.. 16 hours on the road, a few micro sleep blackouts, surprised that i can ride with eyes closed.."
http://www.advrider.com/forums/showpost.php?p=13996547&postcount=2
It's very dangerous I will get myself prepare not to Microsleep by drinking more water and plenty of rest before and during the trip.
It happen to me before mind went blank for few sec during my drive to KL in a hot afternoon after food and drinking not enough water that's why I prefer to ride after the sun went down.