Gay Mccullough,, Age 13, of Huntsville, Ala., for his question:

Do winter hibernators sleep during summer nights?

The woodchuck hibernates four or five months. Recent studies indicate that he may arouse himself every week or so to visit his neat, underground bathroom, but in arty case one would think that his long sleep is enough for the rest of the whole year. But this is not so. When he emerges in the spring, he proceeds with a lazy, daily routine.

He breakfasts at dawn, dozes through the heat of the day, dines again at sunset and retires for a good night's sleep in his burrow. Other winter hibernators also sleep through the summer nights. Those that are active at night sleep through the summer days.