grammar.verbs.reflexive-meaning-change
When se changes the meaning: ir/irse, dormir/dormirse
Adding se shifts the sense: ir (go) / irse (leave), dormir (sleep) / dormirse (fall asleep), quedar (arrange/be located) / quedarse (stay), llevar (carry) / llevarse (take away).
grammarB1v0.1.0
Explication
Pairs to know: ir/irse, dormir/dormirse, quedar/quedarse, llevar/llevarse, poner/ponerse (put / put on, become), volver/volverse (return / turn around, become), comer/comerse (eat / eat up entirely).
The se often adds completion, change of state, or departure. With food and drink it signals finishing the whole thing: se comió toda la pizza.
Exemples
Me voy; ya es tarde.
I'm leaving; it's late.
I'm leaving; it's late.
Région: global
El niño se durmió en el auto.
The kid fell asleep in the car.
The kid fell asleep in the car.
Région: global