Can I run it overnight? Yes, on a low setting. Sukoon runs 16-18 hrs and every SOSA diffuser is cool mist with auto shut-off when the tank empties, so it is safe to leave on low.
Should the scent change with the time? Ideally. Fresh and citrus in the morning, calm and warm in the evening. A scent that fits the hour feels right; one that fights it feels off.
The best scent for each hour
The question behind the question is usually "which scent, when?" - and that I can answer clearly. A fragrance that suits the hour feels effortless; one that fights it feels off, however lovely it is on its own.
Morning. I want the room to feel awake. A citrus or clean white-tea scent - Warm Welcome (Four Seasons-inspired) or White Tea Serenity (Westin-inspired) - on for an hour or two while the day starts. It is a small ritual, but a room that smells fresh at breakfast sets a good tone for everything after.
Daytime. If you are home or working, low and steady is the mode. Something clean and quiet in the background - and in AC-dry or winter air, the cool mist adds a gentle humidity while it scents. This is where a diffuser earns its keep as an all-day companion, not an event.
The evening switch is the one people notice most once they try it. Moving from a bright morning scent to a warm amber or cedar after sunset changes how the whole room feels - it is the same trick a good hotel uses, quietly shifting the lobby scent as the day turns to night.
Evening. After dark I go warm - Old-World Glamour (St. Regis-inspired) amber, or Quiet Luxury (Ritz-Carlton-inspired) white tea and cedar. Run it through the evening on low. The point is not strength, it is softness: a rounder scent that helps you and the room wind down.
Running it overnight, honestly
Plenty of people love falling asleep to a soft scent, and I am one of them. Here is the honest guidance on doing it well and safely.
| Window | Scent | Setting |
|---|---|---|
| Morning | Citrus, white tea | Low, 1-2 hrs |
| Daytime | Clean, quiet | Low, steady |
| Evening | Amber, cedar, tea | Low, through the evening |
| Overnight | Soft, calming | Low; timer or auto shut-off |
Keep it low overnight - a light scent is all you want as you sleep, and it avoids waking to a room that feels heavy. Sukoon is my pick here: it runs 16-18 hours, has steady, 2-hour and 4-hour timers and a soft 7-colour light that doubles as a night light. And because every SOSA diffuser is cool mist with no heating element and an auto shut-off when the tank empties, leaving it on low is fuss-free.
So: there is no single magic hour. Set the tone in the morning, keep the day quiet, warm the evening, and if you like, drift off to something soft. Match the scent to the moment and the diffuser fits your day instead of interrupting it.
The SOSA range
SOSA makes three cool-mist ultrasonic diffusers for different rooms, each arriving with three of our water-based Hotel Collection fragrances so you can scent from day one. Prices and headline specs below are live from the SOSA store. Whichever you choose, use only the SOSA water-based fragrance - raw essential or carrier oils can clog the misting plate.
| Diffuser / refill | Character | Best for | From |
|---|---|---|---|
| Boond (300ml mini) | USB · up to 6 hrs · colour night light · ~150 sq ft | Desk, bedside, hostel | ₹799 |
| Sukoon (500ml) | 16-18 hrs · 7-colour LED · remote + 2H/4H timers · 270-320 sq ft | Bedroom, study, nursery | ₹1799 |
| Megh (6L) | Up to 100 hrs · adjustable mist dial · ~35 dB · large-room humidifier | Living room, dry AC, winter | ₹3499 |
| Hotel Collection fragrance | Water-based refill · 7 hotel-inspired scents · 15/100/300ml | Refill for any SOSA diffuser | ₹299 |
Versailles
I trained as a perfumer at ISIPCA in Versailles, but half the questions we get are not about scent at all - they are about the machine. Indian rooms are bone-dry from AC and winter, and most gadget diffusers are too small, too loud, or quit by midnight. So we made three: Boond (300ml, desk), Sukoon (500ml, bedroom, with a remote and mood light) and Megh (6L, whole-room), each shipping with three of our fragrances.
They are cool-mist ultrasonic diffusers - an ultrasonic plate turns water into a fine, cool mist with no heating element, so there is no boiling water or burn risk, and each has an auto shut-off when the tank runs dry.
One thing I say on every listing and will say here: use only SOSA's water-based Hotel Collection fragrance. Raw essential oils, perfumes and carrier oils are thick or solvent-heavy and can clog the misting plate and damage the unit. A few drops of our water-based fragrance in the tank mists cleanly and scents the whole room.
Frequently asked questions
Facts verified June 2026: SOSA makes three cool-mist ultrasonic diffusers: Boond (300ml, USB, colour night light, up to 6 hrs, ~150 sq ft, ₹799), Sukoon (500ml, 7-colour LED, remote + 2H/4H timers, up to 16-18 hrs, 270-320 sq ft, BPA-free, ₹1799) and Megh (6L, adjustable mist dial, ~35 dB, up to 100 hrs, ₹3499). Each is cool mist (no heating element) with auto shut-off, ships with 3 water-based Hotel Collection fragrances (15ml ₹299 / 100ml ₹999 / 300ml ₹1799), and is made for Indian AC-dry and winter air. Use SOSA water-based fragrance only; raw essential or carrier oils can clog the ultrasonic misting plate. Composed in India; a portion of every order supports Nanhi Kali girl-child education. These are independent, hotel-inspired fragrance interpretations created by SOSA. SOSA is not affiliated with, endorsed by or associated with the hotels named; all hotel names are trademarks of their respective owners and are used only to describe the scent style.