Double check that your lights are receiving power.
Make sure that your light switch is in the "On" position, or that your lamp is both plugged in and switched "On."
See what time your lights are schedule to turn on in your app.
If your Hue lights are enabled, you'll see the time in the summaries on your "Tonight" and "Tomorrow" cards.
If you do not see a time for lighting, then your lights were not scheduled.
Tap the settings cog and scroll to "Enable Hue Lighting" to schedule your lights. See this article for a walk-through:"How do I change my evening and morning lighting?"
If you and your partner selected the same room while setting up your Hue integration, your lights will dim according to the earliest bedtime, and they will fade in according to the latest wake time.
Your bed, phone, and Hue need to be connected to the same network in order to work together.
To test whether your phone can connect to your Hue lights, open the Hue app.
If it fails to connect, make sure your phone has wifi enabled and is on the same network as your lights.
If your phone is able to connect to your lights, make sure your bed is also using the same wifi network.
Go to Settings > your bed > Bed Wifi and check that the "Network Name" matches your phone and lights' network.
See this article if you are having trouble connecting to your bed: "I am not able to connect to my bed"
Delete your Hue integration by going to Settings > your bed > Connected Integrations.
Click on "Philips hue lights" to delete.
See this article to walk through steps to re-integrate your Hue lights: "Setting up Hue with your bed"
Restart your phone, and reboot your bed by unplugging it, waiting one minute, and plugging it back in.