Chin drops, mask leaks

Full mask. His chin sags/drops in his sleep, and when it does the mask starts leaking. I looked at chin straps, but they are for nose masks, not full masks. I am waking up several times a night to the noise of the leaking mask, finding him with his cheeks bulging from the extra air pressure triggered by the leaking. Any ideas about soultions?

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I have found using a mask filter (soft cloth cover that rests between my mask and skin) has helped a lot with mask leakage, even when my chin drops.

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