I've thought about this for a while and I can't comprihend being nothing.I can't imagine having no thought in my head or having no understanding. It's quite scary... But you have to realise death to fully appriciate life. That's what happens when you get old and don't care if you live or die.
I have definite ideas about death. However, I don't really obsess over it. To me, the important aspect is a reminder that our life, whether or not you believe in an afterlife, is finite. Every moment here is precious, to be enjoyed to the greatest degree possible. To me, wishing today were over, or counting hours until the weekend, are terrible wastes of moments that can never be recovered.