Hi tt8!
Is your wig human or synthetic? A great spray that helped me with tangles is Hair Vite Tangle Free Wig Conditioner, especially if your wig is curly. Running through it every night with a wig brush helps too (...on straight wigs...curly ones I use a wide toothed comb...) If you don't care about length, trimming synthetic wigs regularly seems to help deal with the tangles.
Also..for me, sleeping in wigs is a no-n
HTH!
if its human, try silicon mix. Mine love it. If its synthetic, try rinsing it with liquid fabric softener.