How to Use Morning Light to Set Your Child’s Internal Clock

Key Takeaways:

• A baby’s developing circadian rhythm needs external cues to determine what time it is.
• Morning light is one of the best ways to strengthen your child’s circadian rhythm for better sleep.
• Hatch Baby can help your family create calming routines that make sleep easier for everyone.

While it’s totally normal — albeit, frustrating — for newborns to mix up days and nights, there’s a lot you can do to support their developing sense of timing. If you’re past the first few months and baby’s not quite getting the clue that nighttime is for sleeping, it may be time to revisit your morning routine. Yep, you read that right: Morning activities, especially AM sunlight exposure, can help set your baby’s circadian rhythm, leading to more predictable sleep patterns over time. Read on to learn more about how to set a child’s circadian rhythm with morning light.

Table of Contents

1. Morning Light for Baby Sleep: How it Helps
2. How to Use Morning Sunlight to Set Your Child’s Circadian Rhythm
3. FAQs
4. References

Morning Light for Baby Sleep: How it Helps

The circadian rhythm is the body’s internal clock that’s responsible for many biological functions, including when we feel alert and sleepy. External cues help “set” the circadian rhythm, and light is one of the strongest. In the morning, light signals that it’s time to release cortisol for alertness and energy. As light decreases throughout the day, the body stops releasing cortisol and begins releasing melatonin, the sleep hormone.

Experts recommend morning light exposure as a way to strengthen the circadian rhythm and support healthy sleep. For babies with newly developing circadian rhythms, morning light can help them tell what time it is, when to release wakeful hormones, and when it’s time to start winding down at night. Consistent morning light exposure often leads to better nighttime sleep, as your child’s internal clock begins to align with the daily schedule.

How to Use Morning Sunlight to Set Your Child’s Circadian Rhythm

Whether your two-month-old still has days and nights mixed up or your suddenly independent toddler needs a sleep routine reset, here’s how to use morning sunlight for smoother nights.

Do It First Thing in the Morning

If your goal is to strengthen your child’s circadian rhythm, it’s best to prioritize light exposure first thing in the morning, ideally, within 60 minutes after they get up. This first-thing light tells the body that it’s morning and time to start releasing energizing hormones instead of melatonin — setting the stage for a healthy, balanced daily rhythm.

Go Outside When Possible

Direct, outdoor sunlight is the best way to get potent morning sunlight (the kind that really says “it’s wake-up time now.”) When possible, try to get outside with your child within the first hour or so of the day, whether you go for a quick stroller walk or play in the yard. Bonus: You’ll all get a bit of fresh air, and maybe a little exercise, to start the day!

Maximize Natural Light Indoors

If you can’t get outdoors in the morning, don’t sweat it. Natural indoor light can go a long way in supporting your child’s internal clock, so open those blinds and let the sunshine in (ideally, starting in your baby’s room when they wake). A stimulating blue, green, or white light on your child’s Hatch Baby when they wake up can be a helpful add-on to natural light. Pairing light exposure with feeding and other normal morning activities can further strengthen their circadian rhythm, which thrives on consistent routine.

Continue During Schedule Transitions

Speaking of consistency: Nobody’s perfect, but the circadian rhythm loves repetition. The more you repeat the same routine — including morning light exposure — the faster it’ll pick up on the time of day and when to release the right hormones. Results (read: better sleep!) often build over several days, so try to be patient. When you can, keep your morning light routine — and your child’s overall sleep routine — going during transitions, such as travel and Daylight Saving Time. With a consistent pattern, you may find bedtime is smoother and mornings are a bit more joyful.

Learn how Hatch Baby can support your child’s circadian rhythm with routines, plus 24/7 sleep chat.

Frequently Asked Questions

How many minutes of morning light does my child need?

Many sleep experts suggest about 10-20 minutes of natural morning light when possible. Even shorter exposure can help, especially if it’s bright and consistent day to day.

Does morning light help older kids too, or just babies?

Morning light supports circadian rhythm at every age. Toddlers, school-age children, and adults all benefit from consistent light exposure first thing in the morning.

What if we live somewhere with limited morning sunlight?

Do the best you can with available daylight by opening curtains and spending time near windows. Consistency matters more than perfection, and even a little morning brightness can help reinforce the body clock.

References

1. Blume, C., Garbazza, C., & Spitschan, M. (2019). Effects of light on human circadian rhythms, sleep and mood. Somnologie : Schlafforschung und Schlafmedizin = Somnology : sleep research and sleep medicine, 23(3), 147–156. https://doi.org/10.1007/s11818-019-00215-x
2. Mead M. N. (2008). Benefits of sunlight: a bright spot for human health. Environmental health perspectives, 116(4), A160–A167. https://doi.org/10.1289/ehp.116-a160