I test sleep tech for a living and you can often find me in bed kitted out in two sleep trackers, a temperature-control mattress cover and noise-blocking sleep earbuds. But if you were to ask to ask me what single sleep gadget you should buy this Black Friday, I'd say one of the best sunrise alarm clocks.

From brightening up the dark mornings to helping you doze off at night, investing in a sunrise alarm clock has many benefits.

Plus sleep scientists, including insomnia and sleep therapist Dr Anna Joyce and occupational therapist and sleep expert Devina King, warn that harsh, jarring alarm sounds can trigger unnecessary spikes in heart rate and stress hormones first thing in the morning, leaving you feeling groggy.

So, it's time to part ways with your smartphone alarm and invest in a su

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