Do you mean the night (or day) before your flight out of Sri Lanka? Below are practical places and options depending on where your departure is from (Bandaranaike International Airport / Katunayake — the main international airport serving Colombo) and what you need (close to airport, beach stay, budget, or a day room/overnight transit). I’ve included transit distance/time tips and a few well-known hotel suggestions.

Quick tip about timing and transport

• The airport is at Katunayake, north of Colombo; the Colombo–Katunayake (Airport) Expressway makes the trip quick from Colombo or Negombo (typical transfer times: 10–20 minutes from hotels very close to the airport, 30–50 minutes from central Colombo depending on traffic). (en.Wikipedia.org)

If you want to stay extremely close to the airport (best for early-morning flights or late arrivals)

• Airport hotels / transit hotels in Katunayake or immediate vicinity: Cinnamon Airport Garden (also listed as Cinnamon Airport properties), small transit hotels and guesthouses near Seeduwa/Katunayake. These are typically 5–15 minutes from the terminal and often offer airport shuttles. Good when you want minimal transfer stress. (Lavacanza.in)

If you prefer a beach town near the airport (relaxed, restaurants, seaside)

• Negombo (10–20 minutes from the airport) — most travelers pick Negombo the night before departure: it has beach hotels, seafood restaurants, and many airport transfers/taxi services. Popular options there include larger seaside hotels and smaller guesthouses depending on budget. Negombo is the easiest coastal option when leaving from Bandaranaike. (Lavacanza.in)

If you want to stay in Colombo (city, more choices and nightlife)

• Colombo hotels (30–60 minutes to the airport depending on traffic and use of the Airport Expressway). Choose Colombo if you want city restaurants, shopping or business facilities the night before, but allow extra time to reach the airport. The expressway shortens travel time but factor in rush-hour delays. (en.Wikipedia.org)

Budget / guesthouse options

• There are many budget hotels and guesthouses in Seeduwa/Katunayake and Negombo that cater to last-night stays and offer airport pickup at low cost. These are fine if you simply need a safe, inexpensive place to sleep close to the airport. Search for “airport guesthouse Katunayake” or “Negombo budget hotel” for current options. (Lavacanza.in)

Business / comfort options

• If comfort is a priority and you don’t mind paying more, choose one of the full-service hotels in Negombo or a trusted Colombo hotel with reliable airport transfer. Many have late check-in, luggage storage and shuttle service.

Day rooms or short-stay options

• If your layover or last day in Sri Lanka doesn’t require an overnight, look for hotels offering “day rooms” or the airport transit hotels near the terminal. This lets you rest, shower and store baggage for several hours before your flight. (Lavacanza.in)

Practical checklist before booking

• Confirm whether the hotel provides airport pickup/dropoff (very helpful late at night or early morning).
• Check travel time to the terminal for your scheduled flight time (leave extra for traffic and check-in/security).
• If you have an early flight (before dawn) prefer Katunayake/Negombo hotels; for late evening departures you can choose Colombo if you prefer the city.
• Verify luggage storage and late-checkout/day-room policies if you’ll be there only briefly.

If you want, I can:

• Suggest specific hotels by name in Negombo, Seeduwa/Katunayake and Colombo in three price tiers (budget / mid / upscale) with approximate transfer times and links — tell me which airport and the night/date you’ll be staying and your budget, and I’ll pull current options and rates.