Lazy Blogs · September 19, 2026
Ask anyone who has lived here a few years and they will tell you sleep gets worse around November. Not dramatically — just a bit heavier, a bit stickier, a bit harder to settle into.
The temperature barely moves. What changes is how much moisture the air is carrying, and that turns out to matter more for sleep than the number on the thermometer.
Wet season in Bali is not really a temperature event. Nights stay in a similar range to the dry months. What rises is humidity, and with it two things that affect sleep directly.
Your cooling system stops working properly. You lower your core temperature at night largely by evaporating sweat. When the surrounding air is already close to saturated, evaporation slows right down. The sweat stays on your skin doing nothing, and you feel hot in a room that measures perfectly reasonable.
Nothing dries out. In the dry season, moisture that gets into fabric and foam during the night leaves during the day. In the wet season the air outside is carrying almost as much moisture as the air inside, so that daily reset stops happening. Things accumulate instead.
"In the dry season your bed dries out every day and you never notice. In the wet season it stops doing that, and you still don't notice — until something smells."
Bedding gets washed. Floors get mopped. The mattress is the one thing in the room nobody touches for months at a time, and it is also the thing absorbing moisture from your body eight hours a night.
Foam cores are the most affected. Dense polyurethane foam absorbs moisture readily and releases it slowly, so across a wet season it can hold enough to soften, lose support and eventually develop odour. Once moisture is in the core it does not come back out on its own — surface cleaning does nothing for it.
Open-cell latex handles it considerably better because air can move through the material rather than sitting in it. That is the same property that makes it sleep cooler, working on a different timescale. The material detail is in the best mattress for hot and humid climates.
The waterproof protector is the counterintuitive one. It keeps liquid out and traps your own moisture underneath it, against the mattress, for the entire season. A breathable protector gives you spill protection without the trapping.
Bed base matters more in these months than any other time of year, for the same reason — what your mattress needs underneath it covers the airflow side.
Nothing here costs much. It is mostly about doing a few things on a schedule rather than when you remember.
Twenty minutes with windows open on a dry stretch does more than any appliance. Cross-ventilation — two openings on different walls — works far better than one window.
Take everything off down to the bare mattress and leave it for a few hours with air moving over it. This is the single most useful habit of the season and almost nobody does it.
AC removes some humidity but a fan keeps air moving over surfaces, which is what actually prevents damp from settling. Running both beats running one colder.
Head to foot, not flipped. It moves the compression zone and gives the underside a different contact pattern. The wider routine is in how to care for your mattress in Bali.
If your mattress cover is removable, the start and end of the wet season are the natural points to wash it. Cool wash, no fabric softener, dry in shade.
Low season and wet season overlap, which is the worst possible combination for a mattress: rooms sit closed, unoccupied, and sealed, in the months when the air holds the most moisture.
Rooms that are empty still need airing on a schedule. It is a housekeeping task that costs nothing and prevents the most expensive failure mode there is — a mattress that has to be written off years early because something grew in it. Worth building into the quarterly inspection covered in how often to replace mattresses in a villa or hotel.
Most mattress warranties, including ours, require the mattress to be kept in a properly ventilated room. A sealed room through a wet season is exactly the condition that voids cover — see the warranty terms.
Around March or April, do one proper inspection before things dry out and hide the evidence.
Strip to the bare mattress. Put your face close to the surface and breathe in — a musty or sour smell means moisture reached the core. Lift the mattress and check the underside and the base for discolouration or damp patches. Look along the seams, which is where mould appears first.
If you find something, act on it rather than waiting. Preventing mould and mildew on a mattress in Bali covers what is recoverable and what is not. A musty core generally is not.
Because humidity blocks evaporation, and evaporating sweat is how your body sheds heat. The air temperature barely moves; your ability to cool down does.
In a closed bedroom it can, particularly in ground-floor rooms that stay damp. It is not a substitute for ventilation and airing the bed out, but it addresses the same problem from the other direction.
A breathable one, not a sealed one. Fully waterproof membranes trap your own moisture against the mattress for months, which is the opposite of what you want in these conditions.
Strip it back to bare and let air move over it once a month through the season. Daily room ventilation on top of that, whenever the weather allows.
Surface damp, usually yes with thorough airing. Moisture that has reached the core and produced a musty smell, generally not — cleaning the surface leaves the problem inside the material.
Open-cell latex and a removable, washable Tencel cover — designed for a climate where the air stops drying things out for five months a year.
Explore the Original Mattress →Wet season sleep is a moisture problem wearing a temperature costume. Turning the AC down does not fix it, because the issue is not how warm the air is — it is how much water it is already carrying.
Move air rather than just cooling it. Strip the bed back once a month. Keep rooms open when the weather allows, especially the ones nobody is using.
Five months of small habits, or one mattress replaced early. It is not a close call.
