toddler crys for no reason

Li
Hello ladies... I have a toddler boy just turned 2 August.... He is only all day sometimes he jus crys but it's normal but get it get dark and fall asleep around 1-5 am he crys a lot like if he is dreaming something or like with cramps idk how to explain it but I'm worried he's being doing this for like a month he crys desesperatly and like kinda scared 😞😢 has somebody gone throug this???