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
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).