Does a person feel that his time is approaching before he dies?

Firstly: 

In the answer to question no. 763 we
mentioned the deeds that may benefit the deceased. These deeds may be done
in the hope that Allah, may He be exalted, will accept them, and on the
basis of thinking positively of Him, may He be glorified. But as for stating
definitively that these deeds will be accepted, no one can be certain of
that. 

Secondly: 

If your brother (may Allah have mercy on
him) did not fast during Ramadan because of an excuse such as sickness,
travelling or being unable to fast, and that excuse remained valid until
Allah took him in death and he was not able to make them up, then he does
not owe anything and his heirs do not have to make up these days when he did
not fast. 

However, if he was sick with an illness for
which there was no hope of recovery, then in that case he came under the
same heading as an old man who is not able to fast, so poor people should be
fed on his behalf, because this is what was required of him when he was
alive, to feed the poor instead of fasting. 

But if he did not fast for some legitimate
reason and he died without having made up what he could have made up when he
had the opportunity to do so, then his heirs may fast on his behalf. But if
he did not fast on some days in Ramadan out of carelessness and
heedlessness, and he had no excuse, then it is not valid to make up the
fasts on his behalf. 

Please see the answers to questions no.
81030 and 174581 

Thirdly: 

The fact that his sister sees him in her
dreams living in a verdant garden is a good thing, in sha Allah, and there
is the hope that he is blessed by that and that Allah has bestowed upon him
the favour of a good status before Him. But we cannot be certain about any
such matter. Dream interpretation is a vast topic and it is very difficult
to be certain of anything in that regard. But we should focus on the
blessing of Allah and the hope of His kindness and grace. 

Muslim (479) narrated that Ibn ‘Abbaas said:
The Messenger of Allah (blessings and peace of Allah be upon him) drew back
the curtain and the people were lined up in rows behind Abu Bakr. He said:
“O people, there is nothing left of the glad tidings of Prophethood except a
good dream that a Muslim sees or that is seen for him. 

In the answer to question no. 731 we stated
that the belief of Ahl as-Sunnah wa’l-Jamaa‘ah is that we do not testify
that a particular person will go to Paradise or Hell, except in cases where
the shar‘i texts affirm that. 

With regard to some people sensing that
their time of death is near, this cannot be denied in general terms,
especially when there are signs that point to that, although no one knows
exactly when his time will be up or where he will die. Such matters are of
no great significance and have nothing to do with a person’s virtue or
status. Allah knows best what happens of such things. However we may be
definite about what we have said above, that no one knows when his life will
end or where he will die. Allah, may He be exalted, says (interpretation of
the meaning):

“Verily,
Allah! With Him (Alone) is the knowledge of the Hour, He sends down the
rain, and knows that which is in the wombs. No person knows what he will
earn tomorrow, and no person knows in what land he will die. Verily, Allah
is All-Knower, All-Aware (of things)”

[Luqmaan 31:34]. 

And Allah knows best.