I drink a coffee before bed?!

I'm a hardened caffeine addict; before any health freaks try and tell me it's not good for me, I'm too far gone so don't bother! :P

Here's my question. I rely on caffeine to get me through my day now, at least to shots of espresso in the morning, again at elevenses and then after dinner in the evening, and one before bed.

I know this sounds mental, but I can actually sleep quite well even when I drink coffee literally minutes before bed. It helps me stay away from deep, deep sleeping, I hate doing this as I wake up late and groggily. The coffee just helps me sleep light and effectively, and still be up in the morning.

I've done this for years now and not had a problem, anyone else do it?