Nightwear clothes should be comfortable and soft to ensure a good night's sleep. Tight-fitting clothing can be restrictive and uncomfortable, making it difficult to relax and fall asleep. Therefore, the correct answer is option 'D', which states that nightwear clothes should be both comfortable and soft.

Explaining the answer:

Comfortable:
Nightwear clothes should be comfortable to wear, allowing for ease of movement and relaxation. This means that they should not be too tight or clingy, as they can restrict movement and cause discomfort. They should also not be too loose or baggy, as this can also be uncomfortable and disrupt sleep. Comfortable nightwear can help promote relaxation, leading to a more restful night's sleep.

Soft:
Nightwear clothes should be made from soft materials, such as cotton or silk, as these fabrics are gentle on the skin and provide a comfortable and soothing feeling. Soft nightwear can help to prevent irritation and itching, which can be disruptive to sleep. Additionally, soft fabrics can help to regulate body temperature, keeping the wearer cool in warm weather and warm in colder weather.

Tightly Fitted:
Nightwear clothes that are tightly fitted can cause discomfort and restrict movement, making it difficult to relax and fall asleep. Tight clothing can also cause sweating and overheating, leading to discomfort and restlessness. Therefore, it is important to choose nightwear that is loose-fitting and comfortable.

In conclusion, nightwear clothes should be both comfortable and soft to ensure a good night's sleep. Tight-fitting clothing should be avoided, as it can cause discomfort and disrupt sleep. By choosing nightwear that is comfortable and soft, individuals can promote relaxation and improve the quality of their sleep.