Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions


We yawn when we feel sleepy because when we feel sleepy the oxygen in our body reduces and when we yawn we take extra oxygen for our body as our brain need oxygen to function properly
0 0 0
When we feel sleepy, it means we are tired and oxygen reduces in our blood. we yawn to intake more oxygen which our brain need to function properly and help us keep alert.
0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts