Provided you have the right kit, conditions and plan- two lights apiece in case one fails, good knowledge of the site, a clear and easily found/marked entry and exit point, and you are both comfortable diving I see no reason why you should not do a shallow night dive with him.
What is important though is that you take the time to talk through the differences between day and night dives, rehearse/discuss light signals and communications and really re-enforce the need for good buddy skills and practices.
I do a lot of shallow night diving from the shore and often take people with me who haven't night dived before. It is usually an unforgettable experience with them wanting to come back again.
The main thing though is do YOU feel comfortable to lead a night dive for your friend - if you are, then fine, but if you are not that experienced at night diving yourself and feel unsure then don't do it.
What I might feel comfortable with and what you are comfortable with are two different things, and what matters here is how you feel about it not anyone else.
Approached sensibly it is as safe as day time diving, do it without preparing properly, planning and thinking it through and the risks are slightly magnified regarding getting lost and so on.
Have fun and enjoy - Phil
