Are they in their own usergroup? Maybe you can turn moderation on and off for the usergroup at times. You go to bed, you turn on moderation. You get up, you turn it off. Maybe you can write a Scheduled Task to turn that on and off for you. Or, put them in Coventry overnight (they post, but no one can see their posts). (Again, possibly write a Scheduled Task/cron job to do this.)
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