First- Lock your bedroom door!
If you are concerned about little ones wondering into your room in the middle of the night, LOCK the door!
(As soon as our kids moved to their own rooms, my wife & I began closing & locking our bedroom door. A baby monitor helped us keep tabs of things.)
Get a bedside safe. There are many to choose from; so I know you can find one that will suit your needs. (You can mount one inside a draw & "childproof the drawer.)
Since you are a "good" sleeper, you may need a early warning system of some kind. Install an Alarm System and/or get a dog. Both will give you a little extra time in the event of an emergency.