Rapid breathing spells with my 9 year old female

Isabel turned 9 this month. We were concerned about these “rapid breathing spells” that occasionally happen at bedtime? They last 10-20 seconds maybe…. Its not every night, and when It appears it sounds like something is in her nose and she’s trying to blow it out. Could it be an allergy spell? Other that that she’s a healthy girl. Thanks in advance! Danny