Any tips for getting a 2yo to nap of their own accord? Before lockdown he would have a moan in his…

Any tips for getting a 2yo to nap of their own accord? Before lockdown he would have a moan in his cot until he fell asleep for a nap but since lockdown he has been napping in his pushchair during a walk. He will be going back to nursery and they used to cuddle and rock him which obviously they will be trying to avoid now.