Sleeping with archilles tendon

must i sleep with my back because im use to sleeping with stomach and what does it take for the achilles to heal asap.thanks

Hard to say. You need to be a little more specific depending on the degree of the injury to your Achilles. Is it just inflamed? Is it torn or ruptured? Did you have to have surgery? And as far as sleeping, try placing a pillow under your foot. It helped me tremendously to where I could sleep in any position.
I had to have surgery twice. 1st time was for a small tear, recovered in 4 months. 2nd time 1 week past my 4 month recovery of 1st surgery, completely ruptured Achilles and fractured my Calcaneous ( heel bone ). This time the recovery has been long and tedious. Next month, it will be a year since the last surgery and I am still not at 100%. You would really need to discuss this with your Orthopedic Doctor. Everyone’s recovery is different. But I will say it depends on the severity of the injury and what was done as to how fast it will heal.
Good luck to you.