Tropical summer: how to sleep well even in the heat

To fall asleep, the body needs to lower its internal temperature by about 1°C. On Portuguese summer nights, when the room is above 26°C, this process simply doesn't happen effectively. The result: we toss and turn, sweat, and wake up tired.

The good news: sleeping well in summer doesn't require air conditioning. It requires strategy. Here are 8 techniques that work.

1. Strategic fan (not pointed at you)

Pointing a fan directly at your body dries out mucous membranes, causes neck stiffness, and can even worsen sleep. The trick: point the fan at a wall or an open window. This creates air circulation in the room without direct airflow on your body.

2. Ice trick

Place a frozen bottle of water in front of the fan. The air cools as it passes by the bottle — a poor man's air conditioning, but it works surprisingly well in small rooms.

3. Right bedding fabrics

Forget polyester and synthetic fabrics in summer. Prefer:

  • Percale cotton sheets (thin, breathable)
  • Linen if you want luxury — more expensive but the most breathable fabric available
  • Bamboo for pillowcases — absorbs sweat

4. Cooling pillow

The pillow is where most heat accumulates during the night (head perspiration, direct contact). A technical cooling pillow like the Shinsen Dreamura has a cover with heat dissipation technology — you feel the difference from the very first touch.

5. Breathable mattress

Memory foam mattresses dissipate heat less efficiently than pocket spring mattresses. If you regularly wake up drenched in sweat, the mattress might be to blame. The Sora Mattress and the Takumi have a spring structure that allows for internal air circulation — much cooler than solid foam.

6. Lukewarm shower (not cold) before bed

Paradoxically, a lukewarm shower lowers body temperature faster than a cold shower. The skin warms up, blood vessels dilate, and upon leaving the shower, the body rapidly loses heat. Taking a lukewarm shower 30-60 minutes before bed prepares the body for sleep.

7. Hydration distributed throughout the day

Drinking 1L at night before bed = bathroom trips in the middle of the night. Distribute hydration throughout the day — morning and afternoon — and stop drinking significant liquids 2 hours before bed.

8. Window blackouts + total darkness

In the Portuguese summer, the sun starts coming in by 6 AM. Light suppresses melatonin and wakes up the brain even before you consciously wake up. Blackouts or opaque curtains are a small investment with a huge return.

What to absolutely avoid

  • Alcohol at dinner: dilates blood vessels, worsens feeling of heat at night
  • Heavy late meals: force the body to digest instead of resting
  • Intense exercise after 7 PM: raises body temperature for hours
  • Fan pointed directly: dries out mucous membranes and causes neck stiffness

When it really makes sense to invest in air conditioning

If you live in a very hot area (Algarve, inland Alentejo) and have a west-facing bedroom, air conditioning becomes necessary above 28°C at night. Set it to 24°C and turn it off 1 hour before waking up to avoid drying out too much.

See also

Explore: Shinsen Pillow · Sora Mattress

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