[dkarl]

Ditto on putting on weight, ditto on the unpleasant effects of oversleeping to catch up, and ditto on not being sharp. The thing to keep in mind is that you're well beyond the point of diminishing returns. If you aren't achieving maximum output in somewhere between 6 and 10 working hours per day, then you're suffering from distractions -- something else is sucking up your productivity.

See my other post for my difficulty with undoing the habit of undersleeping. Even though I no longer experience any external pressure to undersleep, I still don't get enough sleep and suffer the consequences for it. It's hard to stop.