Laptops can be a real pain, especially if not used correctly. OSHA has some suggestions for properly use.
Laptop users should use a docking station whenever possible. In the proper upright-sitting posture for computer use, the person's torso and neck are approximately vertical and in-line, the thighs are approximately horizontal, and the lower legs are vertical. For more information, visit the Occupational Safety and Health Administration's Good Working Positions page.