I use the app Sleep as Android on my phone, which records all kinds of data on my sleep (starttime, endtime, duration, location, amount of noise, amount of snoring, number of cycles, deep sleep %, actigraphs), and optionally uploads it to a website.
I then use a script to put the bedtime (as in hours after 22:00) into a beeminder goal (yorickvp/sleep), set to a rate of 7 per week so I have to go to bed, on average, before 23:00.