Is your son ready? Is he dry through the night
in his diaper? If he isn't, scale back your
expectations.

Night dryness is not a good indicator of daytime potty training
readiness. 5-15% of 6-year-olds are still wet at night (depending on
whose numbers you use) but nearly all of them will have been potty
trained for quite some time by then. Night dryness depends on a number
of factors in addition to those that are important for daytime dryness,
including depth of sleep, and whether or not the child produces the
hormone that most older children and adults produce to cause them to
produce less urine at night.

--Robyn