Is it permissible to submit a sick leave certificate, even though I am not ill, in order to perform acts of worship during the last ten days of Ramadan at home with my family, knowing that this involves lying?

It is not permissible to request a false sick leave to observe the last ten nights of Ramadan, because that involves lying and deception, which are characteristics of hypocrites. One must strive in acts of worship as much as possible without lying, or request leave without lying or deception.