There's nothing better than a business marketing tool that works for you, even when you're not around. When the retail store closes, there is still traffic passing by that can and should be marketed to.
After hours, or night time, is prime time for using your storefront for marketing. Using a Window Video System (WVS) by Looknglas to animate and bring your storefront windows to life works BEST after dark. Better contrast, no competing with the internal store displays, reaching target audience even when the store is closed can make a huge difference. How about advertising tomorrow's sale? How about promoting your website or Social Media marketing site? How about inviting them to use their phone to download your mobile coupon? There are so many ways to use WVS after dark to continue to market and literally SELL your products.
What did Clapton say? "After midnight, we're gonna let it all hang out!" You've got the brick and mortar location and that window space---use it to make money!