I'm having issues with my 17 year old son (he'll be 18 in 6 days) about night riding.He's been riding about 6 months now on a yamaha xt 225 that I bought for him so the two of us could do some father/son riding together. The problem is that he wants to ride at night and I won't let him. My reasons include, decreased vision, reaction time, deer and other obstacles, etc. I've tried to encourage him to view the bike as a fun machine to be used for mainly recreational purposes as opposed to strictly a transportation source. My emphasis has been dual sport riding. However, this issue is causing increasing friction between us. I was wondering if I am being way off base in my concerns for the risks of riding at night versus the day time. Any thoughts or comments would be appreciated.