If you feel he din`t sleep well because of nasal block, you can try plain saline nasal drops, one drop in each nostril
three to four times a day for about three days.
But you have to be sure that he has no associated ear problems that might make him cranky.
Middle ear problems can happen in association with cold
, more often in bottle fed infants.
If symptoms persist or he gets fever
or not feeding well, its better to see your pediatrican.
Hope I answered your question.