throwing up clear fluid?

went to bed around 11, its now 3 am and ive woken up 3 times and randomly start throwing up some type of clear fluid? like i don't wake up and feel like im gonna be sick, ive literally been waking up already vomiting. it honestly just looks like im throwing up water but its making my throat burn so badly. idk what's going on but now i don't even wanna go back to sleep bc ive already had to clean this up off the floor 3 times bc i don't have any warning before it happens. anyone know what this could be?