Losing weight does make you tighter although it depends on how much weight you lose and how quickly you lose the weight.
When you lose weight slowly and experience small to moderate weight loss your skin will often retract on it's own and if you have significant weight loss you may require medical procedures to tighten the skin.
And with rapid weight loss your skin's elasticity may not have enough time to catch up and leave you with excess skin.
With a slower, more gradual weight loss, it's easier for your skins elasticity to sort of snap back into place, shrinking back down as the fat is lost.
However when too much is lost too fast, the skin's elasticity doesn't have time to catch up.
To get rid of the loose skin, exercise helps, a little.
The sleeping position that is good for weight loss is sleeping on your back and sleeping on your side.
Side sleeping also helps to improve sleep, helps you lose weight and reduce pain, and avoid swelling in the thighs, legs, buttocks.
Sleeping on your side is also good for digestion and avoids the accumulation of fat.
The position that is the healthiest to sleep in is on your side or on your back.
Sleeping on your side or back makes it easier to keep the spine supported and balanced which also relieves pressure on your spine and also enables the muscles to recover and relax.
Sleeping on your back has the maximum health benefits and is good for your spine and in relieving your knee and back pain too.
Sleeping on back can also reduce your back or joint pain.
Also having a pillow that is kept beside your knees can help you keep the curvature of your knee aligned.