No. In fact the Long-eared Jerboa does not have to. They get all of their water from their food. This water is called moisture; it's not water that's right in front of them, but it's stored in their food.
Actually, many things are only awake at night including the Long-eared Jerboa. This means they are nocturnal. They hunt,play and hop around at night and sleep during the day.
Long-eared Jerboas have an excellent sense of hearing. They can use this feature while they are in their deep burrows. They will be able to hear their prey while they're sleeping.