Enter multiple sleep/pass time values

[mystifeid]

If I can see that it's around nine hours to dawn but that at the moment I can only sleep for six, let me enter a pass time value of two hours following by a sleep time of seven hours all in one hit.

I'm fully rested at dawn and want to stay in bed until noon, let me enter a pass time value of 2 hours followed by a sleep period of one hour followed by two more hours of passing time and another hour hour of sleep. Again - all in one hit.

Still only allow the (entire) operation to be cancelled while passing time.