Dehydration happens when your body gets rid of more fluids, usually through sweating or going to the bathroom more than normal, than it absorbs. Drinking too little water during exercise, hot weather, or daily activities can also cause the body to use up its stored water.
Nocturia is defined as the excessive need to get up and urinate during the night. 1  You may find yourself using the bathroom several times per night and this can be disruptive to your sleep. It is generally considered to be abnormal to wake to urinate when it occurs more than once at night.
How you wake up in the morning can determine the need for change or not. If you feel tired, pains or aches and your muscles become stiff or numb when you wake up then it is not a good sign. If you sleep comfortably in other beds and not in yours, then it is the perfect time to seek mattress replacement.