Our son of 3 weeks old stretch and sleepless at night and do more sleeping in the day time only when carried. My wife is worried about it.
Sounds like colic.

Colic is common in babies . It usually starts a few weeks after birth and often improves by age 3 months.
Colic requires no medication, By ages 4 to 5 months, the majority of babies with colic have improved.

But if the pains becomes severe and baby cries continuously, kindly see a doctor.