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You will want to make sure you have what you need for the night and morning close at hand. Gather your clothes and toiletries for the next day and place them on a shelf or somewhere where they will stay dry. Find an outlet for your phone. Make sure you will be able to reach your phone from the tub so you can see what time it is and use it as an alarm in the morning. Bring in anything you will use to entertain yourself, like a tablet, laptop, or a book to read. If there is only one bathroom available, it's best to be on the same page so everyone can agree on how to deal with the situation. You don't want someone turning on the shower on you in the morning! Decide what you will do if someone else needs to use the bathroom during the night. Agree on what time will be reasonable for you to wake up and get out of the bathtub so others can use it for showers in the morning. It's time to get in the tub and start snoozing, so get comfy. Position yourself with your head on the opposite side of the tub from the tap. That way if you forget where you are and sit up you won't bump your head or face on the faucet. Use the fan for white noise if you need to block out background noise to sleep better. Turn out the lights. If you think you might wake up and be disoriented, use a nightlight. That will also help your roommates in case they forget you're in there and you startle them.
Bring your personal items into the bathroom. Touch base with your guests or roommates. Go to sleep!