Luckily most of us at Giz are still young enough not to have to wake up multiple times a night to pee, but when we do reach that stage, we're investing in a Glowing Toilet Seat. Just bright enough so you don't make a mess that
our wives we have to clean up in the morning, but not bright enough so you can't fall back asleep without washing your hands thoroughly.
Cost? You can't put a cost on stuff of this quality (we're not sure but it looks to be around $35).
Product Page [OneGlow via Shiny Shiny]