could someone tell me about toddler sleep cycles

[charlmills]

I read on another thread about toddlers sleep cycles. And a good time to wake them during a nap is after 40 mins or 80 mins etc..
I am trying to cut down dd afternoon nap but really want to avoid grumpyness and meltdowns.
Does anyone know anything about this.
Dd is 2.9 yrs. Thanks

Ive read a bit sleep cycles in no cry sleep soloution and from what i remember most cycles are around 90 minutes. Most of the 'help my baby to sleep' books i have read explain all about sleep cycles at the start so maybe you could check one out of the library.