'A person who walks around while they are asleep' -

• Somnambulist (Noun)
English Meaning: A person who walks around while they are asleep
Bangla Meaning: যে নিদ্রিত অবস্থায় হেঁটে বেড়ায়; স্বপ্নচারী।
Example sentence:
- They say it's dangerous to wake a somnambulist.
- Helen moves through life like a somnambulist.

• অন্য অপশনগুলোর মধ্যে -
• Narcoleptic (adjective/noun)
English Meaning: A person affected by an extreme tendency to fall asleep.
Bangla Meaning: যে অসুখে রোগী মাঝেমাঝেই আচ্ছন্ন হয়ে পড়ে বা স্বলপকালোন ঘুমে তলিয়ে যায়।
Example sentence: For a narcoleptic, being made to sit still in a warm classroom is torture.

• Pedantic (adjective)
English Meaning: Caring too much about unimportant rules or details and not enough about understanding or appreciating a subject.
Bangla Meaning: বিচারবুদ্ধিহীন পণ্ডিতসুলভ।
Example Sentence: This can seem a lot of work, pedantic and fussy but is truly worth it if you can manage.

• Numismatist (noun)
English Meaning: Someone who studies or collects coins, paper money, or medals
Bangla Meaning: মুদ্রা ও পদক সংগ্রাহক; মুদ্রা ও পদক বিশেষজ্ঞ।
Example Sentence: He was an expert in economic affairs and finance and was known as a numismatist—an expert on coinage.

Source:
1. Accessible Dictionary by Bangla Academy.
2. Cambridge Dictionary.
3. Oxford Learner's Dictionary.