One of our favorite sites, sleep.org, has a good article about how cuddling with your partner can affect the quality of your sleep.
It turns out that the overall effect of sharing your bed varies by gender, and in general, men find it easier to sleep with a partner. But, it turns out that there’s one activity that’s good for both sexes:
Cuddling—whether throughout the night or just for 10 minutes before drifting off—triggers your body to release chemicals that help you bond with your partner, decompress after a stressful day, and feel downright blissful. The magic ingredient: the hormone Oxycontin (aptly nicknamed the cuddle chemical). Oxycontin has myriad benefits. It relieves pain, boosts your immune system, and relieves stress, and here’s the bedtime winner—it can even help you sleep.
Get the whole story: How Cuddling Affects Your Sleep