“turn off the lights early and let everyone see you’re boycotting everything happening on that night”
According to a statement by the the Islamic Community, since Muslims already celebrated the Islamic New Year (when Mohammed schlepped from Mecca to Medina) on November 25, they would be violating "...God’s boundaries, and do something their master hates and despises” if they were to celebrate New Years like most everyone else around the world. Okay, so I'm in bed before midnight, but that's because I'd rather stay at home not because anyone has told me it's not kosher.
Quoting from a book by someone you can't even find on google (Almir Dumica, “Pearls of the Sunnah in the Mosaic of Time”), at least in English, they said in a statement,
“On that night, turn off the lights early and let everyone see you’re boycotting everything happening on that night. Do not fear anyone's objections. Don’t you have a right to choose? Do not say, ‘how can I do that, I will change nothing, most people do it. I will be declared a black sheep’,” Dumica writes in the book. “On that night go to bed on time, happy and satisfied that the Allah gave you many benefits that you do not consider often, and which you would become aware of only if you lost them,” the Islamic Community said in its release. “Think about your health and family ... the peace and security you enjoy. Then, each night of the year will be much more dear to you than the New Year’s night is to any of those who eagerly await it all year, while a blessed feeling of triumph will overcome your soul and body, because piousness and reason will have won over passions and ugly customs.”
Before the Bosnian War, during the mid 1990s, the Muslim population was primarily secular. That unfortunately changed when foreign fighters came to fight alongside the Muslim Bosniaks. Now this is what they have to deal with.