Well in 2 weeks I'll be going on a trip to the UK which is roughly 5 hours by plane and since I've always had a fear of flying I decided to take a sleeping pill to help me get through it.

I've basically had some questions regarding sleeping pills.

1) Should I take the pills before or after takeoff?

2) Is there any chance that the sleeping pills might not work for me?

3) How long does it usually take for a sleeping pill to act after digestion?

4) Can I be woken up by noise or someone else after taking a sleeping pill?

5) What are the side-effects after waking up from a sleeping pill?

Thank you.