Stopovers on A120

Somersetlynne

We will be travelling from Somerset to Suffolk in August. we prefer to travel during the evening and early morning. We are looking for a stopover at the Stanstead end of the A120 to sleep for a few hours before making an early start in the morning. I seem
to remember there is a site with details of these but of course now I need it I can' remember the details. Can anyone help please.