If I snooze, I lose!

Woke up at 05:10 am, but don't actually need to get up until 5:30. I used to always wake up before the alarm, but now I don't have an alarm, because my husband gets up an hour later, and he uses the alarm. I just tell myself when to wake up, and it works most of the time; problem is no snooze button in my head, so if I let myself fall back to sleep, I might not wake back up until I'm already late.