mukta,
just came across this thread. poor you guys, just sending you some hugs and i hope you get some real sleep soon. our lo's are about the same age, luke is a very spirited one so his sleep has become and intricate science for me.
just in case it helps....the advice i got from his day care is to control his naps closely at this age. if his tendency is to do a longer am nap (luke's is) then put him down at around 10/10.15 and no matter what wake up at 11.30. then pm nap should be shorter, 45 min, from 3.15 to 4. no sleeping after 4. but if pm nap is the long one then only do 30 min in the am (so 10 to 10.30) then try for 2.00 to 3.30 for pm. try to make sure he is awake around 3.30 again in this scenario, as the longer pm nap will mean longer A time before bed and you can preserve a 7/7.30 bedtime. this has been good advice for us at least.
i cannot be of much help for the nw's, they always leave me answer-less if naps have been good, but sending you some good rest vibes honey. xxxxxxx