Water consumption is not intuitive. When the water bottle is empty is not when dehydration begins. Dehydration begins some hours after that. Further, the lack of water in the water bottle should not prevent sleep. Drinking the last of your water before going to bed should be fine, then getting more in the morning. Now, if one was already dehydrated before going to bed (like the bottle went empty in the morning) THEN that would be a problem.
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