The best replacement for naps is long sleep.

The best alternatives to naps are rated as following:
★★★★★  long sleep
★★★★  uncle z
★★  no naps
  short naps

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Speaking about naps, one probably shouldn't forget about ferber method.

Other search terms related to naps and their ratings are:
★★★★★ ferber method
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naps
long sleep
uncle z