Hi there,
I know that as a general rule anything over 1 1/2 hours is considered a full restorative nap and you would then keep your LO up for their full A time. However my LO's sleep cycles are more like 40 minutes rather than 45 minutes so we sometimes get wake ups at the 1h 20m mark - not sure if this is considered a full nap because if I get his A times right a 2 hour nap is normally possible. Am I right in assuming that the figure of at least a 1h 30m nap is based on two sleep cycles of 45 minutes?