Most of the time I just do MILD and All Day Awareness. However on Friday and Saturday nights I try to do WBTB+MILD since it's the only time I can afford to get up in the middle of the night and the only time I don't have to wake up early the next day.

I sometimes have lucids during afternoon naps, and I get lucids even without waking up in the middle of the night. As for using an alarm, maybe you can use a soft alarm, or a sound that gradually increases? Or maybe you can use a vibrating alarm so you don't wake anyone else up.

Noone can really tell when you will get lucid. Even I don't really get too much into the technical side of REM cycles. However, practicing awareness, reality checks, as well as doing WBTB can greatly help you out. Just keep in mind that every time you sleep is a chance for a lucid!