We check Tom every night about 11pm and for the past week or so have been regularly finding him hypo (<4.0). We cannot understand it - at the moment he doesn't have a cold or anything and has not done anything different exercise wise (he hasn't played out after school etc for about 6 weeks). He eats his food as normal. Could it be he is going through a growing spurt and his body is placing a large demand on the BS? Any experiences of this sort of thing would be appreciated. Dave