I would like to set an alarm for 8 hours sleep.
Background of my question is that if I set my alarm normally, I generally get less hours sleep because I don't get to sleep straight away and I don't know when I do.
If you don't need to wake up at a specific time (to go to work, for example), the best you can do to sleep well, is not setting any alarm at all, and waking up when you feel you had enough of sleep. Don't let the technology taking over your common sense 
At the moment I don't have an alarm as such. I just set google to switch on the light. I generally wake up before this, but when I have an early start I set my alarm for that time. But it would be quite nice to have that option. 
