Why is he doing this?

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My son is going to be seven months old next week, and for the past two to three weeks he's been waking up every hour on the hour at night. The last two days he has been waking up every half hour and tonight he's been waking up every fifteen minutes. We are both exhausted and something's gotta give, but he never seems tired? Why is he doing this? Does it stop? Anyone else going through this or have some advice?