She went to bed that night feeling completely fine.

She kissed her husband, adjusted her favorite blanket, and closed her eyes just as she had done thousands of times over more than seventy years.

But that night was different.

She never woke up again.

When the paramedics arrived, they confirmed what no one had expected: she had suffered a massive heart attack in her sleep. There were no screams, no dramatic signs, no struggle. Just silence in the early hours of the morning.

Many people believe that heart attacks always come with intense pain or obvious symptoms. However, medical reality shows something very different: in many cases, heart attacks and strokes occur during sleep.

Especially between 2 a.m. and 6 a.m., when the body goes through one of its most vulnerable periods. During this time, the blood can become slightly thicker, cortisol levels begin to rise, and the heart rate changes suddenly.

In people over 65—and especially after 75—certain bedtime habits can significantly increase the risk.

Many of these habits seem harmless, but in reality they can disrupt the heart’s balance during the night.

Below are five common nighttime mistakes that, according to cardiology specialists, can increase the risk of heart attacks or strokes while we sleep.

5 nighttime mistakes that can affect your heart

5. Eating too late or too much

One of the most common mistakes is having a heavy meal shortly before going to bed.

After a large meal, the body directs a significant amount of blood to the digestive system to process food. This forces the heart to work harder.

During the day, the body can handle this effort. But when you lie down immediately after eating, digestion continues while the body is trying to rest.

This can cause:

increased heart rate

elevated nighttime blood pressure

heavy digestion

disrupted deep sleep

Specialists recommend finishing your last meal at least three hours before bedtime.

If you feel hungry at night, it’s better to choose something light, such as:

a small handful of almonds

a few slices of turkey

a glass of warm milk

These foods don’t overload the body before sleep.

4. Drinking too much water right before bed

Staying hydrated is important, but drinking large amounts of water right before bed can cause problems.

It can lead to waking up multiple times during the night to use the bathroom, a condition known as nocturia.

Each time someone gets up suddenly, the cardiovascular system must quickly adjust to changes in blood pressure.

In older adults, this can cause:

dizziness

falls

fainting

sudden spikes in blood pressure

The best approach is to drink most of your water during the day and reduce intake in the late evening.

3. Sleeping in a room that is too warm

The body needs to lower its temperature slightly to enter deep, restorative sleep.

When the room is too warm, the body struggles to cool down. This keeps the nervous system active and can increase heart rate.

Studies have shown that sleeping in overly warm environments can lead to:

elevated nighttime blood pressure

lighter, less restorative sleep

increased cardiovascular stress

The ideal sleep temperature is usually between 15°C and 19°C (59°F–66°F).

If you feel cold, it’s better to use light blankets or comfortable clothing rather than raising the heat too much.

2. Sleeping in a position that makes breathing difficult

Sleep posture also plays a bigger role than many people realize.

Sleeping on your back—especially without slightly elevating your head—can contribute to sleep apnea, a condition where breathing temporarily stops multiple times during the night.

When this happens:

oxygen levels drop

the brain sends alarm signals

the heart rate suddenly increases

This cycle can repeat dozens of times during the night, placing constant stress on the cardiovascular system.

Sleeping on your side and slightly elevating your head can help keep airways open.

1. Taking blood pressure medication at the wrong time

The most important mistake relates to the timing of certain medications, especially those used to control blood pressure.

For decades, many people have taken these medications in the morning out of habit.

However, some studies suggest that in certain patients, taking them at night may better control blood pressure during sleep—when many cardiovascular events occur.

This does not mean everyone should change their medication schedule on their own.

But it is important to consult a doctor about the best timing, as each case is different.

Tips to protect your heart at night

To reduce risks while sleeping, specialists recommend adopting simple habits:

eat dinner at least 3 hours before bedtime

reduce fluid intake before sleep

keep the bedroom cool and well-ventilated

sleep on your side if you snore or have breathing issues

follow medical instructions for medications

maintain a regular sleep routine

avoid alcohol and heavy meals at night

consult a doctor if you have loud snoring or breathing pauses

It’s also advisable to have regular medical checkups, especially after age 60.

Many people believe the most dangerous time for the heart is during the day. But in reality, nighttime can be one of the most delicate periods for the body.

Small bedtime habits that seem insignificant can make a big difference in cardiovascular health.