If it doesn't have to be a watch.. just something you can put in your pocket or sleep with I highly recommend getting an "Invisible Clock".
It's a small clock that can be set to vibrate or beep or both. There are three vibration levels and you can set up to 12 alarms. I often use the vibration setting on the highest level, wrap the small clock in a face towel and simply lay the clock so that it's pressed against my body. The vibration isn't "jarring" and another plus to a vibrating clock is that it doesn't disturb anyone else when it goes off (not even someone who is laying right next to me).
Below is one of the websites that sell the Invisible Clock:
http://www.buddhasplace.com/Merchant...ry_Code=Clocks
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