Is there any reason of restlessness in the afternoon?
Restless drowsiness is common after eating. AN7.61 discusses remedies at length, including:


  But if by doing this you don’t shake off your drowsiness, then—percipient of what lies in front &amp; behind—set a distance to meditate walking back &amp; forth, your senses inwardly immersed, your mind not straying outwards. It’s possible that by doing this you will shake off your drowsiness.