@Natalie27101
At that time of night it could be maintenance taking place. This is carried out overnight to keep disruption to a minimum as most customers are asleep. If it hasn't returned by 7ish in the morning then it might be something you need to report to Sky.
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Sky customer since 2001
with: Sky Q | Sky Superfast Broadband | Sky Talk | Sky Mobile
NOTE: I only provide help on the forums and NOT via PM
