Lie flat on the bed and slide the hand into the small of the back. If there is a gap the mattress is probably too hard. If you cannot push your hand in easily the bed is too soft. Roll from side to side. If it is difficult to roll the mattress is too soft.
Have enough width to turn to and fro and to turn over. 5' is the minimum. 5'6" -6' is better when buying a bed.
IF IN DOUBT ABOUT PURCHASING A BED TAKE ADVICE FROM A MEDICAL PRACTITIONER AND DO NOT BE MISLED BY LABELS SUCH AS 'ORTHOPEADIC' OR 'FIRM'
Sleep is the all important regenerative period for the mind and body. Maximum relaxation comes from the anatomically correct posture of the back so there are no discomfort signals. You spend an average a third of your life in bed so it is essential to spend time choosing a bed, and its accessories, to enhance the quality of life.
The optimum comfortable position is where the spine is an 'S' shape when viewed from the side and in a straight line when viewed from the back on a firm mattress.
If the mattress is too hard a 'billiard table' effect causes discomfort to the hips and shoulders and distortion of the back.
On a mattress which is worn out, soft and sagging with broken springs, a 'hammock' effect occurs which gives the spine no support. A bed board under the mattress will help.
When getting in sit on the mattress. Lower the body onto the shoulder. Bend up the knees until the feet can slide onto the bed then rollover onto the back. Reverse when getting out. Always bend the knees.
When making a bed do not stretch across, go round the other side. Use a duvet or fitted sheet where possible. Kneel or bend the knees to tuck in the sheets and use both hands to avoid twisting. Put one foot up on the bed to pull off the sheets.
Pillows are essential for positioning and support. Try to line up the base of the head and back so they are on the same level. Be sure the pillow is resting above the shoulder. Too many pillows can cause a strain on the spine resulting in morning stiffness, arm ache and headaches. A pillow between the knees supports the upper leg so that circulation is not impeded when lying on the side