This is a regular verb. It follows the conjugation pattern of the verb hablar.
PresentPresente
Los domingos descanso en casa con mi familia.
On Sundays I rest at home with my family.
ImperfectPretérito imperfecto
El abuelo descansaba cada tarde después de comer.
Grandpa rested every afternoon after lunch.
ImperativeImperativo afirmativo
Estás muy cansado; descansa un poco.
You are very tired; rest a little.