Type 1 diabetes and fertility

Kimberly • 24 year old, wife and mother.
Does anyone know if type 1 diabetes affects a man's fertility rate? My husband is 32, and has type 1 diabetes. For the most part his sugar levels are controlled fairly well, he does experience crashing low levels in the middle of the night on occasion. We haven't been ttc that long, only for 3 months. Was just curious if it will be more of a challenge for us.