I prefer to put the glaucoma drop in my every night a couple of hours before bedtime instead of right before bedtime. is there any problem doing this?

Right on!: You are absolutely doing the correct thing. Putting your medicated drops in at bed time has proven to create a lot of eye lid inflammation. It is best to use a bland lubricating solution at bed time.

No problem: As long as you use the drops at about the same time daily, that should be just fine. I even have some patients use the drops in the am because they forget at night.