See if the eating, sleeping or behavior problem improves. If so, then there was a connection. Your child is feeling pressured by the toilet training. Wait a few weeks before you resume toilet training. Then do it in a more relaxed way, with more reassurance.
Some children are ready to stay dry all night at a much earlier age than others.
Staying dry during a nap happens first. This is a sign that the bladder capacity is maturing. Some children stay dry at night at the same time that they learn to control their bladder in the daytime. Other children who have a smaller bladder or a less mature bladder continue to wear diapers at night for some time. As long as it does not disturb his sleep.