Philips SmartSleep HF3651/01 Sleep and Wake-Up Light with Simulated Sunrise & Sunset

If mornings feel like a battle, a light-based wake-up can make the first ten minutes of your day feel less abrupt. The Philips SmartSleep Sleep and Wake-Up Light (HF3651/01) is built around simulated sunrise in the morning and a sunset routine at night, plus guided breathing during the wind-down.

It’s not a magic fix, though. If you’re looking for a full smart-home sleep system with lots of integrations, this is more about what it does with light, sound and simple controls. Still, for everyday sleep routines, it’s the kind of device that’s easy to repeat night after night.

The essentials

This is a sleep and wake-up light designed to support your routine after waking and as you prepare to sleep. On waking, it uses a simulated sunrise to help you ease into the day. In the evening, the sunset simulation is paired with RelaxBreathe to support a calmer wind-down.

Philips also claims clinical support for general wellbeing: 92% of users in their study said it improved general wellbeing after waking up, and 92% reportedly found it easier to get up in the morning. It’s a reassuring statistic to consider, even if results will still vary person to person.

If you like the idea of a routine that doesn’t rely on scrolling or complex apps, the Smart touch display is there to keep day-to-day control straightforward.

What you’ll notice in use

The day-to-day appeal here is that it tries to replace a harsh “wake now” moment with something gentler. In the morning, the simulated sunrise approach can be easier on the senses than waking up to bright room light straight away.

At night, the sunset simulation is meant to prepare your body for sleep, and RelaxBreathe is the breathing element. In practical terms, that means you’re not just switching the light off—you’re moving into a wind-down mode with light and guided breathing.

A simple example: if you typically lie in bed for a while before switching off, you could start the sunset simulation as part of your routine, follow the RelaxBreathe guidance for a set wind-down period, and then stop once you’re ready. It’s a method that suits people who find sleep habits hard to start, not people who want a purely “leave it running” device.

Key takeaways

• Morning support via simulated sunrise, intended to make getting up feel easier.
• Evening wind-down via simulated sunset, designed to prepare your body for sleep.
• RelaxBreathe to Sleep uses light-guided wind-down breathing, aimed at helping you relax.
• Smart touch display for easier device control, rather than complicated navigation.
• Multiple lights and sounds are included, so you’re not locked into a single ambience.

That said, since the exact number of lights/sounds isn’t listed in the information provided, it’s worth focusing on whether multiple ambience options matter to you.

Tech specs

• Name: Philips SmartSleep Sleep and Wake-Up Light, Simulated Sunrise and Sunset, Multiple Lights and Sounds, RelaxBreathe to Sleep (HF3651/01)
• Type: Sleep and wake-up light
• Dimensions (W x D x H): 225 x 220 x 120 mm
• Cord length: 1.5 m
• Display/controls: Smart touch display
• Brightness levels: Personalized brightness levels to choose what suits you

Where it shines

This is a good fit if you want a sleep routine that’s simple to repeat: light-based waking, followed by a light-and-breathing wind-down. It’s also a sensible choice if you prefer control that’s direct (smart touch) rather than relying on a phone.

It may make more sense than more basic alarm clocks if you’re sensitive to abrupt light changes or you’d like a more gradual “wake up” experience. And compared with a purely audio-based approach, the sunrise/sunset simulations give you another channel to help cue your body.

Take note: while the clinical claim is a positive sign, it’s not a guarantee. If you’re in the habit of turning the room fully bright for the first hour, the benefits may depend quite a lot on how you set up your bedroom and your routine.

Is it worth it?

Worth buying if you’re aiming to improve your morning feel and you want a structured wind-down that combines simulated sunset with RelaxBreathe guided breathing. It suits people who value consistency and like having brightness options and multiple lights/sounds.

You may want to skip it if you don’t plan to stick to a routine (because the value is in repeat use), or if you expect deep smart features beyond what’s described here. Also, if space is tight on your bedside, do check the listed dimensions and consider the 1.5 m cord before committing.

Mini FAQ

Does it help with waking up? Philips reports that 92% of users found it easier to get up in the morning, and that it supports general wellbeing after waking.

What’s RelaxBreathe for? RelaxBreathe is the light-guided wind-down breathing that pairs with the sunset simulation to help you relax to sleep.

Can you adjust the brightness? Yes—there are personalised brightness levels so you can choose what feels right.

How do you control it? It uses a Smart touch display, aimed at making device control easier.

Is the box content always the same? Packaging may vary, so it’s worth expecting small differences in what’s included in the outer box.