Old Smokey,
5 - 10 mg of diazepam per month (that's only 1-2 5 mg tablets per month, or 2.5-5 2 mg tablets per month) is not considered to be within the "risk zone" for withdrawal symptoms or dependency.
But if you're taking diazepam for when you have to sleep, you might like to consider shorter acting alternatives like tamazepam or non-benzodiadepine hypnotics like zolpidem or zopiclone?