Selecting the right mattress is crucial to ensuring quality sleep and to prevent physical discomfort. Despite the myriad of mattress brands and types on the market today, finding the one that suits you best doesn't have to be an insurmountable challenge. Understanding the factors to consider when purchasing a mattress is key to a good investment and can go a long way to guarantee a night of uninterrupted sleep.

First, let's focus on the distinct types of mattresses available. Traditional innerspring mattresses remain a popular choice for their bounce and familiarity but advancements in material science led to the advent of the hugely popular memory foam mattresses. Unlike traditional innerspring mattresses, memory foam molds to the shape of the sleeper's body, providing personalized support and reducing pressure points. Other options available are latex mattresses known for their resilience and cooling properties and hybrid mattresses that incorporate elements of both innerspring and foam.

Now, although the type plays a monumental role, your choice should not hinge only on it. Human bodies have special needs to consider, like our varying weight and the specific positions we take while sleeping. For instance, softer mattresses could benefit side sleepers to allow more sink for their shoulders and hips. On the other hand, back or stomach sleepers might need a firmer mattress for better spinal alignment.

Another important factor to dwell on is temperature regulation, an influential component in the sleep experience. If you tend to overheat at night, organic fabrics in latex mattresses or cooling gel in memory foam mattresses could stymie the rise in your body temperature, ensuring a more comfortable sleep.

For online buyers, the mattress industry has seen a significant shift. Many companies now offer trial periods, allowing customers to test mattresses for typically 100 days before deciding whether to keep it or return it for a refund. Buying in-store, on the other hand, allows for initial testing but poses a logistic issue if you change your mind later.

Lastly, the golden rule while purchasing a mattress is not to rush. Take your time exploring, understanding, and deciding. A mattress is an investment – not just in an object but in your health, well-being, and years of peaceful sleep.

This brief guide to buying mattresses is by no means exhaustive but endeavors to demystify the process. Remember, the best mattress is highly personal and depends on your individual preferences and needs. So, be well informed, and ensure your mattress indulges you in the luxury of good sleep.