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The bleeding initially stops due to pressure from the gauze. But if you can let off the pressure and bleeding has subsided or nearly quit, then your goal is achieved and you can either gradually or fairly immediatly begin to not use the gauze any more if the bleeding has subsided.
No you could use it when in bed, even asleep, just use caution, not to inhale it (very rare to occur). And yes there would be no damage to the clot or your gums, if you use the gauze when there is almost no blood. That should be no problem.
I'd just ween off it gradually. It may be in an hour, or 8 hours from now. I hope that makes sense Paula!
Perhaps you've understandably gone to bed. I hope you get a good night rest!
*Let me know should you have any further concerns - OK?