also i don't see the problem with showering before bed and in the morning (though i don't find it necessary for myself). if you're going to shower again in the morning anyway, the shower before bed doesn't have to be a long deal, just get you clean. shampoo and soap yourself up, rinse off, which takes me about 5 minutes tops.
and i do a lot of other fancy shit in the shower (wash face, conditioner, shave, etc.) which i'd just save for morning.
don't have to look beautiful when you're sleeping.