During which month do people sleep the least?

The dirtier I get, the whiter I look. Who am I?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

These types of puzzles are known as charades. What you have to do is find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be office.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.

I am sometimes honest
Sometimes dishonest
I can be sweet and also bitter
I can hurt you real bad and
also make u smile and blush ☺️
What am I?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?