So, for the weekend your friend Vasya stopped by, and you are going to play poker or nine until late! So tomorrow you will sleep all day. Tomorrow! Where will Vasya sleep? You have already taken out a shapeless mass called 'Inflatable Mattress' from the mezzanine. What to do next?
Steps

Step 1. Find the pump
Most air mattresses come with a pump. Open the mattress valve, insert the pump and turn it on! The electric pump is loud, so try to think about it early so as not to wake anyone up. Inflate the mattress thoroughly and completely.

Step 2. Use a hair dryer if there is no pump
The hairdryer works much worse than the pump, but noticeably quieter. But if the hair dryer fits the valve, it should work. Just don't use hot air.

Step 3. As a last resort, inflate the mattress with the force of your lungs
Take a deep breath. Press your mouth firmly against the valve and exhale as much as you can. Inhaling through your nose, hold the air inside the mattress with your throat. Repeat until the mattress is firm.

Step 4. Close the valve, take pillows, blankets and bedding

Step 5. Use until the mattress deflates, or deflate yourself
Advice
- The hair dryer will inflate better if you make the "adapter" with your hand.
- If you inflate the mattress with a hairdryer, blow the mattress slightly with your mouth.
- The valve arrangement of some mattresses does not allow air to pass back. This is convenient if you need to catch your breath while inflating.
Warnings
- Don't faint. If you suddenly see colored spots in front of your eyes, or feel strange sensations on your skin, take a few breaths in and out, and tell yourself that everything will be okay.
- Hot air from a hairdryer can ruin the mattress. Install a cold stream, if possible.