A buzzing sound for up to 10 minutes may occur during calibration if the Sleep is moved, plugged back in, or pressure is taken off the bed.

However, if the sensor otherwise makes loud noises, or the calibration takes longer than ten minutes (or never finishes), do the following:

1. First, check the Sleep for any physical damage like swelling, expansion, rips, tears, or separation by pulling the bladder out of the sleeve. 
   
2. If you find any damage, please submit a support ticket with a video or photo and a description of the issue.
3. If there's no visible damage, unplug the Sleep and ensure the sensor inside the textile cover is straight/flat and not folded/creased. Straighten any bends or twists, then plug it back in. Use the Sleep for the next 48 hours to see if the issue is resolved.

If the LED light shows on the sleep sensor, please see this article.