A local grocery store invited customers for a sleepover to cool off as the heat wave continues in Helsinki, Finland, August 4, 2018.

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Customers are seen laying on a mattress at local grocery store to cool off.
A local grocery store invited customers for a sleepover to cool off as the heat wave continues in Helsinki, Finland, August 4, 2018.
Credit: Lehtikuva/Heikki Saukkomaa/via Reuters