Always remember if you want to increase the life time of your laptop don't use laptop of sofa or bed or on any related material where the vents of laptop are blocked.
if you take your laptop to bed be sure to use some cooling pad with large and quiet fan. You can also use a book that has the same dimensions like notebook. It`s important not to block any air circulation inside.
If you really want to use you it in bed, then put something beneath it so that there is some room for the air to pass. That way, passage of air will not be blocked.