I can assure you I would not fall asleep. However, how the actual commentating would be would depend on the race. There's quite a difference between a race with the first hour - or more - is a relentless fight to get in the break, and a race with Offredo and Rossetto just getting away in the first 100 metres.Oh god, please no.
"Hello and welcome to a very special edition of (insert race here). The flag has dropped and they're off! (five hours later after waking up) Yeah, it looks like the four riders are still in the breakaway but that lead is steadily decreasing. (Looks at Sean Kelly) Sean, do you think the breakaway will stay away? (Sean) Oh, sod off.