More than likely, no damage. As long as it didn't get down to frost level. Now if you did this a few nights then I could see them getting stunted to grow for a while. Even then they would more than likely recover just fine after a week or two...
When you get to 37/38 degrees you get the weather phenomenon "light frost" where somehow you get a mild frost well above freezing. Â Â As long as you didn't have frost on your vehicle/furniture in the morning you will be fine. Â As soon as the soil is consistently above 50 degrees you'll be alright and the plants will recover. Â
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We as gardeners tend to overthink things.Â