You don't say how old your child is. There are lots of things that could be keeping him up. Somethings to consider.
Growth spurts usually occur at 3 weeks, 6 weeks, 3 months, 6 months, and 1 year.
Teething can begin as young a 4 months and continue until the teeth come in.
Noise (I see you asked about this is another post). We use white noise for our daughter. Sometimes she needs it and sometimes she doesn't.
Temperature. The outside temp as dropped recently. Is it cold or drafty in his room. Try putting more layers on him (t-shirt, long sleaved shirt, pjs, and sleepsack works for us on cold nights). We cut the draft with the plastic windo wrap. Or is he too warm.
Does he have a cold or a stuffy nose that makes it hard for him to breath. Try a cool mist humidifer for this.
Gassy or Constipation. Our daughter was very gassy as a newborn and became gassy again when we started solids. Try some baby message techniques for either gass or constipation.
Baby just misses you. All babies wake in the night and some are able to soothe them selves and some need help from parents. I find it helpfull to have baby in her own room with a safe toy in the crib. When she wakes she can play with the toy and fall back to sleep. Of course this doesn't always work. I usually wait until she cries before going to her.
Right now my 10 month old takes 2 naps that are at least an hour long. She sleeps from 7pm to about 6:30am and wakes 0-3 times a night. When she was younger than 6 months old she took 3-4 shorter naps.
This is the best info I can give you with the limited info you provided. Hope you find something helpful.