19 month old DS seems to be keen to drop down to one nap, but can't stay awake past 10am. This week he has been napping 10-12ish. I've been at work and we both have a fairly long commute home so he's dropped off for 30 mins 4.45-5.15 in the car. This seems to keep him going until bedtime but doesn't interfere with bedtime. It's fine if we're in the car but don't really fancy having to go for a drive every weekend afternoon. I wondered about starting 'quiet time' at home at this time. I don't want to put him down in his cot and wake him up after 30 minutes, though this could be an option. Any tips for easing the transition until he's napping a bit later in the day and can easily go until bedtime? Thanks