When we first started traveling in Mexico occasionally we'd go out to the road and watch the night time traffic - cars with families, all taking what we thought were crazy chances by driving after dark. Only a few vehicles had burnt out or missing lights. We soon tried driving at night too after weighing the risks. We'd leave Durango at 2am so we could get on the old Mexico 40 before the trucks did. On our return trip we'd leave Teacapan at 2am for the same reason - to get ahead of the truck traffic on Mex40 to Durango.
Here in Maine night driving in rural areas carries the risk of hitting a moose - which due to it's long legs (the mass of the body hurtles towards the windshield) and dark coloring (can't see them) can kill or cripple the car's occupants. On a motorcycle it's said that any critter one hits that is larger than one could eat in a single sitting can cause a crash. Deer are wild cards 24/7.
Anyhow, driving at night in Mexico carries risks that I can weigh against risks of heavy truck traffic during the day (double trailers in Mexico are 130 feet long counting the tractor). Mexico has changed hugely and night time travel - especially on toll roads - isn't as dangerous as it once was. Daytime driving in heavy traffic hurtling along over narrow and poorly striped roads, unsafe passes (on 200 between PV and Tepic one can either pass or be passed with equal risks of a crash) carries its own risks compared to nighttime travel. I prefer daytime driving, but there are occasions when nighttime driving works for me.