I take 20mg for sleep every night. 10mg won't kill you. As long as you don't stay on a high, constant dosage like my doctor has had me on for years (before I knew about involuntary addiction and hell they can wreck in withdrawals.)

I'm sorry for your loss. But 10mg won't kill you. I would be more worried about falling asleep or not being able to walk. Since 20mg for me is used for sleep, then 10mg might make someone sleepy like it does me but if you're not even used to 5mg constantly, you might not want to go up to 10mg.