You might think you have your sleep position down. “Body posture has been found to have a significant impact on sleep,” says Dr Deborah Lee, from Dr Fox Online Pharmacy. What’s the best position to sleep in? You might think that the ‘best’ sleep position is subjective – we all have specific preferences after all, and what works for one person might not work for another. “The best sleeping position is the one that gives you the correct spinal alignment,” says Lee.