fever at night

Overview

A fever at night is a rise in body temperature that you notice more when you are trying to sleep. It is a common sign that your body is fighting an infection, not an illness itself. Body temperature naturally rises slightly in the evening, which can make a fever feel worse at night.

Very common. Almost everyone will experience a fever at some point, especially children. Nighttime fevers are especially frequent because of the body's natural daily rhythm.

Fever can affect people of all ages. It is most common in young children, whose immune systems are still developing. Older adults may experience fevers less often or have lower temperature rises, even when infected.

Symptoms

Common symptoms

• Feeling hot or flushed
• Chills and shivering
• Sweating
• Aching muscles or headache
• Weakness and fatigue
• Dry mouth or thirst

Symptoms in children

• Irritability or fussiness
• Poor feeding or reduced appetite
• Warm or hot skin
• Rapid breathing or fast heart rate
• Seizures (febrile convulsions) – rare but frightening

Symptoms in older adults

• Confusion or increased drowsiness
• Decreased appetite or drinking
• Falling or unsteadiness
• Sudden change in behaviour or activity
• Temperature may not be very high

Causes

Main causes

• Viral infections – the most common cause, such as colds, flu, and COVID-19
• Bacterial infections – such as throat infections, urine infections, or pneumonia
• Inflammation – such as from a new injury or an inflammatory condition
• Heat exhaustion – being too warm or overexposed to heat
• Some medicines or immunisations – fever can be a expected response

Risk factors

• Being a young child with an immature immune system
• Being in close contact with someone who is ill
• Having a long-term health condition like diabetes, heart or lung disease
• Taking medicines that suppress the immune system (for a chronic illness or transplant)
• Not having up-to-date vaccinations

When to see a doctor

See a doctor urgently if:

• Any fever in a baby under 3 months
• Fever with a rash that does not fade under a glass
• Fever with severe headache, stiff neck, or sensitivity to light
• Fever with difficulty breathing or chest pain
• Fever with confusion, a seizure, or drowsiness that is not normal

Book a routine appointment if:

• Fever lasting more than 3 days
• Fever that goes away and then returns
• Recurring fevers without an obvious cause
• Fever with no other symptoms that worries you

Diagnosis

The doctor will ask about your symptoms, how long the fever has lasted, and whether you have other complaints. They will usually check your temperature, heart rate, and breathing, and look for signs of infection.

Tests that may be done

• Blood tests – to look for signs of infection or inflammation
• Urine test – to check for a urinary infection
• Throat or nasal swab – for respiratory viruses
• Chest X-ray – if the doctor suspects a lung infection

What to expect at your appointment

Diagnosis is usually straightforward. The doctor will explain what they think is causing the fever, whether you need treatment or monitoring, and what to watch for. You may be sent home with clear instructions, or – less often – admitted to hospital if you need more support.

Treatment

The main aim is to treat the cause if an infection is found. Most fevers do not need any specific medicine. Home care focuses on comfort, fluids, and resting. Medicines can help lower a fever and relieve aches but they only work for a few hours and do not treat the underlying infection.

Self-care at home

• Rest – stay home, lie down, and take it easy
• Drink plenty of fluids – water, weak squash, or soup – to avoid dehydration
• Wear light clothing and use a light sheet – avoid heavy layers
• Keep the room at a comfortable, cool temperature
• Wipe your forehead with a cool (not cold) cloth if that feels soothing
• Check on yourself or your child regularly, especially at night

Medical treatments

If an infection is confirmed, your doctor may recommend antibiotics for bacterial infections (these are not effective for viruses). For fever and discomfort, over-the-counter fever-relieving medicines are available — ask your pharmacist or doctor which product and strength is right for you or your child. Always use only the product recommended for a child's age. Some serious infections need hospital care and IV fluids, but this is unusual.

Living with this condition

While you have a fever at night, expect disturbed sleep and possibly more intense symptoms. Focus on getting plenty of fluids during the day and keeping the bedroom cool. Keep a thermometer handy to track temperature, but remember how you feel matters more than the number.

Lifestyle tips

• Keep a regular sleep routine as much as possible
• Stay hydrated through the day, not only when you feel thirsty
• Avoid heavy meals and alcohol while the fever lasts
• Use light bedding at night
• Wash hands frequently to stop spreading infection to others

Diet and exercise

Eat light if you feel hungry – soups, toast, rice, or fruit are fine. Do not force food if you feel unwell. Rest is more important than exercise; return to your normal activity gradually as the fever subsides.

Mental health and emotional wellbeing

A persistent fever can feel worrying, especially for parents. Night-time fevers are common and usually pass quickly. If you feel anxious, speak to a nurse or doctor; they can give you reassurance and practical advice.

Prevention

Not all fevers can be prevented, but many infections that cause fever can be reduced with simple hygiene such as regular handwashing, covering your nose and mouth when sneezing, and avoiding close contact with people who are unwell.

Vaccines

Vaccines are one of the most important ways to prevent serious infections that cause fever, such as flu and pneumonia. Make sure your childhood and adult vaccinations are up to date by asking your local health service.

Complications

If left untreated

• Dehydration from not drinking enough
• Febrile seizures in children (usually short and not harmful, but need medical review)
• Sepsis – a rare but serious complication from a severe infection; requires urgent care
• Worsening of the underlying condition causing the fever

Long-term outlook

The outlook for a fever is almost always excellent. Most fevers clear within a few days and home care is all that is needed. For the few that need medical treatment, prompt care helps you or your child recover fully. A fever at night is common, not a cause for panic — with the right information and support, it is entirely manageable.

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