Calpol Vapour Refill Pads (10). Plug in the CALPOL® Vapour Plug & Nightlight to release soothing lavender and camomile vapours that comfort your child through the night and help with clear & easy breathing.. Its soft, blue nightlight provides a gently reassuring glow, as well as guiding you in the room so you can avoid disturbing your child while they rest.. The CALPOL® Vapour Plug & Nightlight is suitable to use with any CALPOL® medicines. Each refill lasts up to 8 hours.. Nightlight is only activated when the lights go out