I keep it in my bedroom in lieu of a clock. "Hey Siri, what time is it?" and for offloading thoughts to my to-do lists that I might forget in the morning, without getting out of bed, i.e. "Hey Siri, add 'call X about Y' to my personal list"
My alarm. I always charge my phone downstairs, use the alarm feature in the Sonos app. Disable the snooze option. This forces me to go all the way downstairs to get my phone in order to turn it off. I sleep great, waking up can be a struggle so this helps.