Twins sleeping together?

Kendra • Just had my twin girls on June 10th
Hi twin mommies I was wondering who lets their infant twins sleep together and if so do they sleep all cuddled up beside each other? Mine really like being together and sometimes seem to get as close as possible to each other, they will scoot closer to each other if they start out apart. They are 4 weeks old. I know your not suppose to co sleep due to the risk of sids so I got to wondering if them sleeping together raises their risk. I googled it but there apparently isn't any studies on twins co sleeping so just thought I would reach out here .