No, you cannot nap in 1-Day Acuvue Define lenses. As 1-Day Acuvue Define are not approved for overnight wear (a full night's sleep), napping in them for a short period of time is not advisable either, and it can lead to eye-health complications. Napping for any length of time with contacts not designed for such an environment is risky. Choose a lens that is approved for overnight wear and seek guidance from your ECP if this is a requirement for you.