In the absence of any injury/trauma to the lower back or leg, the symptoms can be attributed to nerve
compression as a result of incorrect sleeping posture.
Stretching exercises under the guidance of a Physiotherapist will be helpful.
You can also take nervigenic agents like Vit B6, Vit B12 & Folic acid
in your diet.
If symptoms still persist, kindly get certain investigations like estimation of blood glucose
& blood pressure levels, and an MRI
of lumbosacral spine done to rule out any pathological cause for the symptoms.